Year Month EP index 1948 1 -0.6964 1948 2 -0.2971 1948 3 0.3970 1948 4 -0.9968 1948 5 -0.9244 1948 6 -1.4789 1948 7 -1.8694 1948 8 -1.0300 1948 9 -0.9738 1948 10 -1.0906 1948 11 -0.5039 1948 12 -1.5761 1949 1 -1.3237 1949 2 -0.2873 1949 3 0.0692 1949 4 0.3520 1949 5 -0.7498 1949 6 -0.9097 1949 7 -1.7989 1949 8 -1.2760 1949 9 -1.4737 1949 10 -1.2577 1949 11 -0.9924 1949 12 -0.5556 1950 1 -1.0531 1950 2 -1.0232 1950 3 0.3423 1950 4 0.0678 1950 5 -0.3582 1950 6 -0.7966 1950 7 -0.5992 1950 8 -0.0110 1950 9 -0.1134 1950 10 0.1726 1950 11 -0.6572 1950 12 -0.3892 1951 1 -0.0235 1951 2 0.0983 1951 3 -0.7058 1951 4 -0.7694 1951 5 -0.9076 1951 6 0.5078 1951 7 1.0686 1951 8 1.0081 1951 9 0.5274 1951 10 0.7224 1951 11 0.7678 1951 12 0.3420 1952 1 -0.1469 1952 2 0.2471 1952 3 0.2266 1952 4 -0.5157 1952 5 -0.6298 1952 6 -0.6737 1952 7 -0.5683 1952 8 -0.2999 1952 9 -1.1819 1952 10 -0.3908 1952 11 -0.9925 1952 12 -0.6519 1953 1 -0.5123 1953 2 0.1389 1953 3 0.8415 1953 4 0.7171 1953 5 0.1690 1953 6 -0.4073 1953 7 -0.6401 1953 8 -0.4263 1953 9 0.1096 1953 10 -0.7895 1953 11 -0.8134 1953 12 -0.6911 1954 1 -1.1857 1954 2 -0.8994 1954 3 -0.4857 1954 4 -2.4942 1954 5 -2.3167 1954 6 -2.0139 1954 7 -1.6131 1954 8 -1.2911 1954 9 -1.2474 1954 10 -1.2744 1954 11 -0.9403 1954 12 -1.4842 1955 1 -0.8123 1955 2 -0.1931 1955 3 -0.3425 1955 4 -1.0688 1955 5 -1.8219 1955 6 -1.7206 1955 7 -1.4847 1955 8 -1.4740 1955 9 -1.3821 1955 10 -1.4217 1955 11 -0.9455 1955 12 -1.6084 1956 1 -0.6511 1956 2 -0.2278 1956 3 0.2046 1956 4 -0.0773 1956 5 -0.7081 1956 6 -0.8438 1956 7 -0.6843 1956 8 -0.2420 1956 9 -0.6458 1956 10 -1.1749 1956 11 -1.4088 1956 12 -1.6085 1957 1 -1.2266 1957 2 -0.2222 1957 3 0.5325 1957 4 0.1399 1957 5 0.6215 1957 6 1.1550 1957 7 1.7595 1957 8 0.8512 1957 9 0.2871 1957 10 -0.2416 1957 11 0.2718 1957 12 0.3082 1958 1 -0.6117 1958 2 -0.8458 1958 3 -0.6339 1958 4 -0.3507 1958 5 -0.3944 1958 6 -0.3892 1958 7 -0.3074 1958 8 -0.2139 1958 9 -0.4892 1958 10 -0.8248 1958 11 -0.8033 1958 12 -1.0754 1959 1 -1.0569 1959 2 -0.5416 1959 3 -0.4415 1959 4 -0.5425 1959 5 -0.7227 1959 6 -0.2712 1959 7 -0.6316 1959 8 -0.9979 1959 9 -0.5457 1959 10 -0.2667 1959 11 -0.1023 1959 12 -0.2763 1960 1 0.2331 1960 2 0.3420 1960 3 0.2223 1960 4 -0.1321 1960 5 -0.5616 1960 6 -0.6139 1960 7 -0.5076 1960 8 -0.2508 1960 9 -0.1961 1960 10 -1.0339 1960 11 -1.3903 1960 12 -1.0775 1961 1 -0.4516 1961 2 0.2673 1961 3 -0.2235 1961 4 0.4002 1961 5 -0.1833 1961 6 -0.4015 1961 7 -1.3353 1961 8 -1.1054 1961 9 -1.6779 1961 10 -1.3133 1961 11 -1.1147 1961 12 -0.8470 1962 1 -0.3430 1962 2 -0.0629 1962 3 -1.2104 1962 4 -1.7408 1962 5 -0.9473 1962 6 -0.9761 1962 7 -0.8149 1962 8 -0.4727 1962 9 -0.7293 1962 10 -0.8283 1962 11 -1.0200 1962 12 -1.2063 1963 1 -0.4896 1963 2 -0.4260 1963 3 -0.3856 1963 4 -0.4095 1963 5 -0.0068 1963 6 0.1873 1963 7 0.0667 1963 8 -0.3479 1963 9 -0.5443 1963 10 -0.6092 1963 11 -0.7310 1963 12 -0.5198 1964 1 -1.0133 1964 2 -1.2854 1964 3 -1.0739 1964 4 -1.6495 1964 5 -2.4860 1964 6 -1.4029 1964 7 -0.7458 1964 8 -0.9678 1964 9 0.0797 1964 10 -0.0123 1964 11 0.2293 1964 12 -0.2930 1965 1 -0.1675 1965 2 0.1043 1965 3 0.4612 1965 4 1.3396 1965 5 1.2198 1965 6 0.8680 1965 7 0.6051 1965 8 0.5436 1965 9 0.2044 1965 10 -0.1005 1965 11 0.3160 1965 12 0.4561 1966 1 0.0269 1966 2 -0.9089 1966 3 -2.1624 1966 4 -1.8031 1966 5 -2.3765 1966 6 -2.0892 1966 7 -1.8641 1966 8 -1.6986 1966 9 -1.8870 1966 10 -1.4096 1966 11 -2.0003 1966 12 -1.5696 1967 1 -0.6830 1967 2 0.0178 1967 3 -0.7553 1967 4 -1.5313 1967 5 -1.2371 1967 6 -1.0450 1967 7 -1.3653 1967 8 -1.8610 1967 9 -2.2208 1967 10 -2.2598 1967 11 -2.3427 1967 12 -2.2033 1968 1 -1.9871 1968 2 -1.7840 1968 3 -1.6423 1968 4 -1.3645 1968 5 -1.4550 1968 6 -1.6932 1968 7 -0.6874 1968 8 -0.6320 1968 9 -0.5021 1968 10 -0.7156 1968 11 -1.3684 1968 12 -1.0634 1969 1 -1.2256 1969 2 -1.8700 1969 3 -0.8487 1969 4 -0.3041 1969 5 0.3955 1969 6 0.2678 1969 7 -0.2581 1969 8 -0.6417 1969 9 -0.7741 1969 10 -0.3526 1969 11 -0.4711 1969 12 0.0899 1970 1 0.0120 1970 2 -0.9235 1970 3 -1.1002 1970 4 -1.1809 1970 5 -1.9396 1970 6 -2.3462 1970 7 -2.9262 1970 8 -2.0998 1970 9 -1.1092 1970 10 -1.0269 1970 11 -1.4382 1970 12 -0.6253 1971 1 -0.3727 1971 2 -0.8514 1971 3 -0.5661 1971 4 -0.3013 1971 5 -0.8428 1971 6 -1.1319 1971 7 -0.7427 1971 8 -1.0571 1971 9 -0.6247 1971 10 -1.0362 1971 11 -0.9839 1971 12 -1.5528 1972 1 -0.3269 1972 2 -0.1651 1972 3 -0.3010 1972 4 -0.3329 1972 5 -0.2334 1972 6 0.6409 1972 7 1.4279 1972 8 2.0971 1972 9 1.1351 1972 10 0.9156 1972 11 1.0850 1972 12 1.5636 1973 1 0.9895 1973 2 -0.1329 1973 3 -0.4721 1973 4 -0.9885 1973 5 -1.2195 1973 6 -1.1444 1973 7 -1.1489 1973 8 -0.8575 1973 9 -0.6647 1973 10 -0.4698 1973 11 -0.1192 1973 12 -0.1573 1974 1 -0.1445 1974 2 -0.2145 1974 3 -0.0629 1974 4 0.3704 1974 5 0.2605 1974 6 -0.0588 1974 7 0.2531 1974 8 0.0358 1974 9 -0.1234 1974 10 -0.4320 1974 11 -0.5838 1974 12 -0.8000 1975 1 -0.6560 1975 2 -1.2514 1975 3 -0.4399 1975 4 0.2176 1975 5 -0.2918 1975 6 -0.4579 1975 7 -0.0466 1975 8 0.3225 1975 9 0.4094 1975 10 0.2697 1975 11 0.0260 1975 12 -0.6743 1976 1 -0.6072 1976 2 -0.1815 1976 3 -0.2595 1976 4 -0.1022 1976 5 0.3815 1976 6 1.4972 1976 7 1.2339 1976 8 1.2403 1976 9 1.1527 1976 10 0.6581 1976 11 0.2041 1976 12 0.6573 1977 1 0.7640 1977 2 0.4825 1977 3 0.0119 1977 4 -0.5931 1977 5 -0.4148 1977 6 -0.4835 1977 7 -0.9754 1977 8 -1.3667 1977 9 -1.3821 1977 10 -0.8405 1977 11 -1.1148 1977 12 -1.3067 1978 1 -1.0086 1978 2 -0.8197 1978 3 -0.8970 1978 4 -1.0392 1978 5 -1.7328 1978 6 -1.2775 1978 7 -0.6289 1978 8 -1.0457 1978 9 -1.0920 1978 10 -0.6339 1978 11 -0.1120 1978 12 0.2748 1979 1 -0.4478 1979 2 -0.4271 1979 3 -0.2790 1979 4 0.2291 1979 5 0.2716 1979 6 0.0632 1979 7 -0.2410 1979 8 0.4369 1979 9 0.5496 1979 10 0.2226 1979 11 -0.0667 1979 12 -0.1928 1980 1 -0.4370 1980 2 -0.6661 1980 3 -0.6243 1980 4 -0.5127 1980 5 -0.5131 1980 6 -0.4921 1980 7 -0.9715 1980 8 -0.3666 1980 9 -0.2336 1980 10 -1.0163 1980 11 -0.5519 1980 12 -0.4985 1981 1 -1.4193 1981 2 -1.1327 1981 3 -0.4182 1981 4 -0.2122 1981 5 -0.0945 1981 6 -0.0021 1981 7 -0.2300 1981 8 -0.6076 1981 9 -0.2277 1981 10 -0.2823 1981 11 -0.6415 1981 12 -0.3262 1982 1 0.0355 1982 2 -0.1477 1982 3 -0.9279 1982 4 -0.9433 1982 5 -0.5941 1982 6 -0.0858 1982 7 0.3881 1982 8 0.9736 1982 9 1.7830 1982 10 1.6393 1982 11 2.6979 1982 12 3.2726 1983 1 3.1450 1983 2 2.4819 1983 3 2.1787 1983 4 2.7329 1983 5 3.0075 1983 6 3.4508 1983 7 3.0630 1983 8 2.6929 1983 9 1.8444 1983 10 1.2514 1983 11 0.8026 1983 12 0.5692 1984 1 0.4785 1984 2 0.4618 1984 3 0.8053 1984 4 0.8318 1984 5 -0.2664 1984 6 -0.7084 1984 7 -0.6177 1984 8 -0.1523 1984 9 -0.0277 1984 10 -0.4207 1984 11 -0.0581 1984 12 -0.0754 1985 1 -0.2709 1985 2 -0.5790 1985 3 -0.0291 1985 4 -0.3068 1985 5 -0.4554 1985 6 -0.3570 1985 7 -1.1814 1985 8 -1.4102 1985 9 -1.1963 1985 10 -1.2231 1985 11 -1.4067 1985 12 -1.2046 1986 1 -0.6519 1986 2 -0.1648 1986 3 -0.5105 1986 4 -0.3571 1986 5 -0.7844 1986 6 -1.0050 1986 7 -0.4954 1986 8 -0.6168 1986 9 -0.6073 1986 10 -0.5041 1986 11 -0.4188 1986 12 0.3131 1987 1 0.4568 1987 2 0.4465 1987 3 0.7024 1987 4 0.9204 1987 5 1.0396 1987 6 0.3480 1987 7 0.6210 1987 8 0.5488 1987 9 0.7651 1987 10 0.2480 1987 11 0.0566 1987 12 0.1416 1988 1 -0.3222 1988 2 -0.7296 1988 3 -0.6952 1988 4 -0.6867 1988 5 -0.9443 1988 6 -1.3661 1988 7 -1.6139 1988 8 -1.5600 1988 9 -0.8621 1988 10 -0.0614 1988 11 0.0618 1988 12 0.0998 1989 1 0.7829 1989 2 1.2301 1989 3 0.3977 1989 4 0.3470 1989 5 -0.4833 1989 6 0.2199 1989 7 -0.2559 1989 8 -0.1191 1989 9 -0.6070 1989 10 -0.5072 1989 11 -0.2382 1989 12 -0.8228 1990 1 -1.0017 1990 2 -0.4814 1990 3 -0.9667 1990 4 -0.7352 1990 5 -0.4013 1990 6 -0.6626 1990 7 -0.9957 1990 8 -1.0539 1990 9 -1.0491 1990 10 -1.7256 1990 11 -1.8330 1990 12 -1.8140 1991 1 -1.6142 1991 2 -1.2972 1991 3 -0.9462 1991 4 -1.0405 1991 5 -0.8302 1991 6 -0.1678 1991 7 0.0058 1991 8 -0.6474 1991 9 -0.7131 1991 10 -0.6822 1991 11 -0.4486 1991 12 -0.3803 1992 1 0.1894 1992 2 0.1127 1992 3 0.4157 1992 4 1.0699 1992 5 1.1080 1992 6 0.2297 1992 7 -0.9212 1992 8 -0.8625 1992 9 -0.6267 1992 10 -0.7657 1992 11 -0.6921 1992 12 -1.0105 1993 1 -0.5174 1993 2 0.6038 1993 3 0.4971 1993 4 0.9830 1993 5 1.2955 1993 6 0.4711 1993 7 0.1219 1993 8 -0.0366 1993 9 -0.5678 1993 10 0.0315 1993 11 -0.4694 1993 12 -0.8095 1994 1 -0.5088 1994 2 -0.5064 1994 3 -1.1204 1994 4 -1.5043 1994 5 -1.2282 1994 6 -1.2161 1994 7 -2.1009 1994 8 -2.4535 1994 9 -1.6037 1994 10 -0.6649 1994 11 -0.5530 1994 12 -0.7304 1995 1 -0.5379 1995 2 -1.1513 1995 3 -1.7501 1995 4 -2.1416 1995 5 -2.1261 1995 6 -1.3804 1995 7 -1.0803 1995 8 -1.7193 1995 9 -1.4265 1995 10 -1.2689 1995 11 -0.9535 1995 12 -1.0000 1996 1 -0.7080 1996 2 -0.0962 1996 3 -0.0216 1996 4 -1.0508 1996 5 -1.1116 1996 6 -1.2033 1996 7 -1.1294 1996 8 -1.0734 1996 9 -0.8217 1996 10 -1.1048 1996 11 -1.4080 1996 12 -1.9397 1997 1 -1.8411 1997 2 -1.5455 1997 3 -0.8501 1997 4 -1.0478 1997 5 0.4891 1997 6 2.0431 1997 7 2.6595 1997 8 3.2983 1997 9 3.1482 1997 10 3.2983 1997 11 3.6953 1997 12 3.9044 1998 1 3.3865 1998 2 2.7838 1998 3 2.5089 1998 4 2.7567 1998 5 2.7613 1998 6 2.4190 1998 7 1.7110 1998 8 1.6554 1998 9 1.0261 1998 10 1.1192 1998 11 1.1114 1998 12 1.0496 1999 1 0.8911 1999 2 1.0339 1999 3 1.3871 1999 4 0.1832 1999 5 -0.0451 1999 6 -0.0253 1999 7 0.0830 1999 8 0.1078 1999 9 -0.6288 1999 10 -0.6371 1999 11 -0.3738 1999 12 -0.1172 2000 1 -0.3053 2000 2 0.6646 2000 3 1.2693 2000 4 1.6409 2000 5 0.8504 2000 6 -0.0862 2000 7 -0.7039 2000 8 -0.6996 2000 9 -0.2624 2000 10 -0.2523 2000 11 -0.5837 2000 12 0.1586 2001 1 0.5005 2001 2 1.1344 2001 3 1.2658 2001 4 0.7016 2001 5 -0.1066 2001 6 -0.6772 2001 7 -1.2981 2001 8 -1.3449 2001 9 -2.0645 2001 10 -1.9641 2001 11 -2.1049 2001 12 -1.8970 2002 1 -2.0531 2002 2 -1.3355 2002 3 -0.0277 2002 4 -0.7781 2002 5 -0.8609 2002 6 -0.8211 2002 7 -1.2883 2002 8 -1.1411 2002 9 -0.7195 2002 10 -0.4992 2002 11 -0.3505 2002 12 -0.4190 2003 1 -0.6163 2003 2 -0.8453 2003 3 -0.9276 2003 4 -1.2746 2003 5 -1.8008 2003 6 -1.5875 2003 7 -0.9217 2003 8 -0.5314 2003 9 -0.8374 2003 10 -0.5126 2003 11 -0.1222 2003 12 -0.1602 2004 1 -0.2244 2004 2 -0.2959 2004 3 -0.3643 2004 4 -0.6171 2004 5 -1.4757 2004 6 -1.2107 2004 7 -1.5840 2004 8 -1.6815 2004 9 -1.5232 2004 10 -1.1480 2004 11 -0.6616 2004 12 -0.8920 2005 1 -1.4876 2005 2 -1.7907 2005 3 -1.5985 2005 4 -1.0271 2005 5 -0.6155 2005 6 -0.7741 2005 7 -0.4970 2005 8 -0.5549 2005 9 -1.1631 2005 10 -1.5516 2005 11 -2.3202 2005 12 -1.8453 2006 1 -0.7591 2006 2 0.5695 2006 3 0.0970 2006 4 -0.8340 2006 5 -0.6777 2006 6 -0.9260 2006 7 -0.7870 2006 8 -0.3841 2006 9 -0.0146 2006 10 0.0549 2006 11 -0.1487 2006 12 0.0662 2007 1 0.2296 2007 2 -0.3572 2007 3 -1.4243 2007 4 -1.4903 2007 5 -1.8037 2007 6 -1.5499 2007 7 -1.3534 2007 8 -1.9432 2007 9 -1.4335 2007 10 -1.6030 2007 11 -1.6519 2007 12 -1.3953 2008 1 -0.0282 2008 2 1.1460 2008 3 1.0486 2008 4 1.2798 2008 5 1.1667 2008 6 0.9427 2008 7 1.2692 2008 8 1.2175 2008 9 1.1238 2008 10 1.0025 2008 11 0.2146 2008 12 0.1679 2009 1 0.6060 2009 2 0.6297 2009 3 -0.2109 2009 4 -0.1505 2009 5 0.0457 2009 6 0.2507 2009 7 0.1738 2009 8 -0.0332 2009 9 -0.4536 2009 10 -1.0950 2009 11 -1.2741 2009 12 -1.0909 2010 1 -1.3339 2010 2 -0.9283 2010 3 -0.9033 2010 4 -0.8504 2010 5 -0.7004 2010 6 -0.5710 2010 7 -0.8822 2010 8 -0.5768 2010 9 -0.2193 2010 10 -0.2940 2010 11 -0.9376 2010 12 -0.6423 2011 1 -0.3520 2011 2 0.1750 2011 3 -0.4256 2011 4 -0.3332 2011 5 -0.3703 2011 6 -0.0031 2011 7 -0.3597 2011 8 -0.6371 2011 9 -0.7198 2011 10 -0.9921 2011 11 -0.5851 2011 12 -0.3466 2012 1 0.3103 2012 2 0.8901 2012 3 1.1745 2012 4 1.0788 2012 5 1.0182 2012 6 1.1885 2012 7 0.5745 2012 8 -0.0956 2012 9 -0.5258 2012 10 -1.2858 2012 11 -1.7222 2012 12 -1.6959 2013 1 -1.2518 2013 2 -0.4578 2013 3 0.2944 2013 4 -0.4444 2013 5 -1.2619 2013 6 -1.8788 2013 7 -1.7700 2013 8 -1.4776 2013 9 -1.2849 2013 10 -1.1644 2013 11 -0.7000 2013 12 -0.5598 2014 1 -0.3217 2014 2 -1.0923 2014 3 -0.6318 2014 4 -0.8530 2014 5 -0.3441 2014 6 0.2560 2014 7 0.1056 2014 8 -0.4993 2014 9 -0.7319 2014 10 -0.5506 2014 11 -0.5861 2014 12 -0.6295 2015 1 -0.8752 2015 2 -1.4420 2015 3 -1.2423 2015 4 -0.9604 2015 5 -0.2272 2015 6 0.3300 2015 7 0.8549 2015 8 0.8345 2015 9 1.3055 2015 10 1.3298 2015 11 1.1001 2015 12 1.2708 2016 1 1.4834 2016 2 0.7950 2016 3 0.3841 2016 4 0.1260 2016 5 -0.1769 2016 6 0.0061 2016 7 -0.1844 2016 8 -0.2615 2016 9 0.2508 2016 10 0.1500 2016 11 0.3945 2016 12 0.5655