Year Month EP index 1948 1 -0.6532 1948 2 -0.2825 1948 3 0.4146 1948 4 -0.9493 1948 5 -0.7761 1948 6 -1.3584 1948 7 -1.7020 1948 8 -0.8881 1948 9 -0.8784 1948 10 -0.9498 1948 11 -0.4406 1948 12 -1.4671 1949 1 -1.2398 1949 2 -0.2227 1949 3 0.1299 1949 4 0.4208 1949 5 -0.5942 1949 6 -0.8045 1949 7 -1.6226 1949 8 -1.1268 1949 9 -1.3671 1949 10 -1.1215 1949 11 -0.9197 1949 12 -0.4797 1950 1 -1.0098 1950 2 -1.0341 1950 3 0.3230 1950 4 0.0740 1950 5 -0.2771 1950 6 -0.7558 1950 7 -0.5081 1950 8 0.0808 1950 9 -0.0331 1950 10 0.2581 1950 11 -0.6270 1950 12 -0.3368 1951 1 -0.0083 1951 2 0.0915 1951 3 -0.6797 1951 4 -0.7219 1951 5 -0.7776 1951 6 0.6122 1951 7 1.2619 1951 8 1.1991 1951 9 0.6731 1951 10 0.9140 1951 11 0.9012 1951 12 0.4698 1952 1 -0.0464 1952 2 0.3270 1952 3 0.3132 1952 4 -0.4228 1952 5 -0.4758 1952 6 -0.5312 1952 7 -0.3596 1952 8 -0.1275 1952 9 -1.0516 1952 10 -0.2441 1952 11 -0.9001 1952 12 -0.5433 1953 1 -0.4374 1953 2 0.1991 1953 3 0.8937 1953 4 0.7738 1953 5 0.3220 1953 6 -0.2633 1953 7 -0.4253 1953 8 -0.2167 1953 9 0.2704 1953 10 -0.5812 1953 11 -0.6834 1953 12 -0.5746 1954 1 -1.1269 1954 2 -0.8732 1954 3 -0.4619 1954 4 -2.4485 1954 5 -2.2007 1954 6 -1.9386 1954 7 -1.4665 1954 8 -1.1609 1954 9 -1.1523 1954 10 -1.1637 1954 11 -0.8953 1954 12 -1.4210 1955 1 -0.7999 1955 2 -0.1861 1955 3 -0.3131 1955 4 -1.0423 1955 5 -1.7125 1955 6 -1.6506 1955 7 -1.3439 1955 8 -1.3362 1955 9 -1.2927 1955 10 -1.3222 1955 11 -0.9244 1955 12 -1.5803 1956 1 -0.6603 1956 2 -0.2494 1956 3 0.1869 1956 4 -0.1102 1956 5 -0.6694 1956 6 -0.8054 1956 7 -0.5525 1956 8 -0.1395 1956 9 -0.5761 1956 10 -1.0606 1956 11 -1.3467 1956 12 -1.5244 1957 1 -1.1735 1957 2 -0.1699 1957 3 0.5811 1957 4 0.2002 1957 5 0.7576 1957 6 1.2694 1957 7 1.9542 1957 8 1.0557 1957 9 0.4575 1957 10 -0.0365 1957 11 0.4055 1957 12 0.4387 1958 1 -0.5219 1958 2 -0.7744 1958 3 -0.5605 1958 4 -0.2690 1958 5 -0.2329 1958 6 -0.2615 1958 7 -0.1257 1958 8 -0.0302 1958 9 -0.3373 1958 10 -0.6458 1958 11 -0.6829 1958 12 -0.9509 1959 1 -0.9833 1959 2 -0.4916 1959 3 -0.3898 1959 4 -0.4832 1959 5 -0.5815 1959 6 -0.1589 1959 7 -0.4431 1959 8 -0.8275 1959 9 -0.4031 1959 10 -0.1062 1959 11 -0.0294 1959 12 -0.2008 1960 1 0.2841 1960 2 0.3517 1960 3 0.2553 1960 4 -0.0927 1960 5 -0.4576 1960 6 -0.5426 1960 7 -0.3603 1960 8 -0.1061 1960 9 -0.0591 1960 10 -0.8706 1960 11 -1.3114 1960 12 -0.9738 1961 1 -0.3881 1961 2 0.3068 1961 3 -0.1860 1961 4 0.4250 1961 5 -0.0767 1961 6 -0.3063 1961 7 -1.1811 1961 8 -0.9535 1961 9 -1.5641 1961 10 -1.1726 1961 11 -1.0319 1961 12 -0.7760 1962 1 -0.3327 1962 2 -0.0499 1962 3 -1.1926 1962 4 -1.7262 1962 5 -0.8470 1962 6 -0.9118 1962 7 -0.6690 1962 8 -0.3254 1962 9 -0.6257 1962 10 -0.7018 1962 11 -0.9401 1962 12 -1.1299 1963 1 -0.4519 1963 2 -0.4195 1963 3 -0.3765 1963 4 -0.4114 1963 5 0.0795 1963 6 0.2449 1963 7 0.2354 1963 8 -0.1640 1963 9 -0.3855 1963 10 -0.4176 1963 11 -0.6007 1963 12 -0.4107 1964 1 -0.9499 1964 2 -1.2595 1964 3 -1.0600 1964 4 -1.6243 1964 5 -2.3882 1964 6 -1.3489 1964 7 -0.6361 1964 8 -0.8664 1964 9 0.1331 1964 10 0.0743 1964 11 0.2720 1964 12 -0.2528 1965 1 -0.1370 1965 2 0.1294 1965 3 0.4876 1965 4 1.3758 1965 5 1.3393 1965 6 0.9767 1965 7 0.8026 1965 8 0.7575 1965 9 0.3672 1965 10 0.1124 1965 11 0.4692 1965 12 0.6019 1966 1 0.1295 1966 2 -0.8358 1966 3 -2.0712 1966 4 -1.7298 1966 5 -2.2216 1966 6 -1.9561 1966 7 -1.6699 1966 8 -1.5021 1966 9 -1.7523 1966 10 -1.2411 1966 11 -1.8883 1966 12 -1.4648 1967 1 -0.6491 1967 2 0.0199 1967 3 -0.7143 1967 4 -1.4501 1967 5 -1.0946 1967 6 -0.9452 1967 7 -1.1838 1967 8 -1.7135 1967 9 -2.1218 1967 10 -2.1305 1967 11 -2.2758 1967 12 -2.1285 1968 1 -1.9505 1968 2 -1.7440 1968 3 -1.6231 1968 4 -1.3572 1968 5 -1.3817 1968 6 -1.6067 1968 7 -0.5328 1968 8 -0.4835 1968 9 -0.3921 1968 10 -0.5565 1968 11 -1.2560 1968 12 -0.9406 1969 1 -1.1198 1969 2 -1.7674 1969 3 -0.7757 1969 4 -0.2354 1969 5 0.5294 1969 6 0.3716 1969 7 -0.0724 1969 8 -0.4593 1969 9 -0.6204 1969 10 -0.1403 1969 11 -0.3233 1969 12 0.2025 1970 1 0.0771 1970 2 -0.8603 1970 3 -1.0478 1970 4 -1.1291 1970 5 -1.8005 1970 6 -2.2421 1970 7 -2.7497 1970 8 -1.9755 1970 9 -1.0454 1970 10 -0.9166 1970 11 -1.3846 1970 12 -0.5757 1971 1 -0.3704 1971 2 -0.8658 1971 3 -0.5725 1971 4 -0.2997 1971 5 -0.7737 1971 6 -1.0785 1971 7 -0.6072 1971 8 -0.9622 1971 9 -0.5825 1971 10 -0.9574 1971 11 -0.9419 1971 12 -1.4781 1972 1 -0.2576 1972 2 -0.1153 1972 3 -0.2538 1972 4 -0.2757 1972 5 -0.0782 1972 6 0.7687 1972 7 1.6197 1972 8 2.2841 1972 9 1.2949 1972 10 1.1289 1972 11 1.2296 1972 12 1.7094 1973 1 1.0721 1973 2 -0.0691 1973 3 -0.4107 1973 4 -0.9469 1973 5 -1.0907 1973 6 -1.0844 1973 7 -1.0177 1973 8 -0.7546 1973 9 -0.6144 1973 10 -0.3764 1973 11 -0.0795 1973 12 -0.1378 1974 1 -0.1592 1974 2 -0.2251 1974 3 -0.0684 1974 4 0.3514 1974 5 0.3309 1974 6 -0.0042 1974 7 0.3742 1974 8 0.1603 1974 9 -0.0523 1974 10 -0.3110 1974 11 -0.5185 1974 12 -0.7490 1975 1 -0.6298 1975 2 -1.2274 1975 3 -0.4256 1975 4 0.2095 1975 5 -0.2217 1975 6 -0.4160 1975 7 0.0530 1975 8 0.3972 1975 9 0.4320 1975 10 0.3369 1975 11 0.0185 1975 12 -0.6510 1976 1 -0.6042 1976 2 -0.1734 1976 3 -0.2397 1976 4 -0.0820 1976 5 0.4808 1976 6 1.5855 1976 7 1.4095 1976 8 1.4098 1976 9 1.2931 1976 10 0.8385 1976 11 0.3113 1976 12 0.7431 1977 1 0.8236 1977 2 0.5054 1977 3 0.0570 1977 4 -0.5311 1977 5 -0.2880 1977 6 -0.3649 1977 7 -0.7518 1977 8 -1.1696 1977 9 -1.2313 1977 10 -0.6637 1977 11 -1.0031 1977 12 -1.1781 1978 1 -0.9245 1978 2 -0.7691 1978 3 -0.8499 1978 4 -1.0041 1978 5 -1.6160 1978 6 -1.2078 1978 7 -0.4980 1978 8 -0.9132 1978 9 -0.9834 1978 10 -0.4903 1978 11 -0.0293 1978 12 0.3662 1979 1 -0.3574 1979 2 -0.3800 1979 3 -0.2389 1979 4 0.2558 1979 5 0.3792 1979 6 0.1583 1979 7 -0.0526 1979 8 0.6004 1979 9 0.6830 1979 10 0.3853 1979 11 0.0408 1979 12 -0.0932 1980 1 -0.3642 1980 2 -0.6078 1980 3 -0.5591 1980 4 -0.4499 1980 5 -0.3836 1980 6 -0.3866 1980 7 -0.7933 1980 8 -0.2091 1980 9 -0.0939 1980 10 -0.8532 1980 11 -0.4528 1980 12 -0.4001 1981 1 -1.3693 1981 2 -1.0916 1981 3 -0.3799 1981 4 -0.1977 1981 5 -0.0055 1981 6 0.0361 1981 7 -0.1089 1981 8 -0.4828 1981 9 -0.1333 1981 10 -0.1363 1981 11 -0.5442 1981 12 -0.2129 1982 1 0.1018 1982 2 -0.1142 1982 3 -0.8802 1982 4 -0.8804 1982 5 -0.4595 1982 6 0.0226 1982 7 0.5817 1982 8 1.1714 1982 9 1.9427 1982 10 1.8440 1982 11 2.8363 1982 12 3.4027 1983 1 3.2241 1983 2 2.5422 1983 3 2.2288 1983 4 2.7574 1983 5 3.1221 1983 6 3.5617 1983 7 3.2879 1983 8 2.8962 1983 9 1.9885 1983 10 1.4375 1983 11 0.9130 1983 12 0.6869 1984 1 0.5291 1984 2 0.4685 1984 3 0.8274 1984 4 0.8572 1984 5 -0.1636 1984 6 -0.5995 1984 7 -0.4404 1984 8 -0.0035 1984 9 0.0859 1984 10 -0.2729 1984 11 0.0281 1984 12 0.0060 1985 1 -0.2260 1985 2 -0.5503 1985 3 0.0027 1985 4 -0.2964 1985 5 -0.3773 1985 6 -0.2945 1985 7 -1.0264 1985 8 -1.2660 1985 9 -1.0899 1985 10 -1.0725 1985 11 -1.3282 1985 12 -1.1252 1986 1 -0.5972 1986 2 -0.1168 1986 3 -0.4759 1986 4 -0.3372 1986 5 -0.7107 1986 6 -0.9449 1986 7 -0.3648 1986 8 -0.4773 1986 9 -0.4677 1986 10 -0.3335 1986 11 -0.3008 1986 12 0.4266 1987 1 0.5188 1987 2 0.4983 1987 3 0.7679 1987 4 0.9703 1987 5 1.1813 1987 6 0.4726 1987 7 0.8321 1987 8 0.7574 1987 9 0.9505 1987 10 0.4870 1987 11 0.2161 1987 12 0.3007 1988 1 -0.2100 1988 2 -0.6519 1988 3 -0.6237 1988 4 -0.6383 1988 5 -0.8302 1988 6 -1.2887 1988 7 -1.4812 1988 8 -1.4550 1988 9 -0.7971 1988 10 0.0071 1988 11 0.0810 1988 12 0.1383 1989 1 0.7744 1989 2 1.2113 1989 3 0.3941 1989 4 0.3503 1989 5 -0.4022 1989 6 0.2583 1989 7 -0.1206 1989 8 0.0028 1989 9 -0.5192 1989 10 -0.3886 1989 11 -0.1660 1989 12 -0.7307 1990 1 -0.9325 1990 2 -0.4281 1990 3 -0.8969 1990 4 -0.6944 1990 5 -0.3020 1990 6 -0.5614 1990 7 -0.8241 1990 8 -0.8901 1990 9 -0.9233 1990 10 -1.5499 1990 11 -1.7229 1990 12 -1.6866 1991 1 -1.5282 1991 2 -1.2431 1991 3 -0.8796 1991 4 -0.9547 1991 5 -0.6837 1991 6 -0.0500 1991 7 0.1969 1991 8 -0.4546 1991 9 -0.5423 1991 10 -0.4926 1991 11 -0.3245 1991 12 -0.2488 1992 1 0.2742 1992 2 0.1722 1992 3 0.4907 1992 4 1.1285 1992 5 1.2427 1992 6 0.3569 1992 7 -0.7362 1992 8 -0.6854 1992 9 -0.4903 1992 10 -0.5855 1992 11 -0.5732 1992 12 -0.8735 1993 1 -0.4059 1993 2 0.6750 1993 3 0.5685 1993 4 1.0279 1993 5 1.4257 1993 6 0.5782 1993 7 0.2995 1993 8 0.1240 1993 9 -0.4171 1993 10 0.2186 1993 11 -0.3337 1993 12 -0.6627 1994 1 -0.4171 1994 2 -0.4537 1994 3 -1.0393 1994 4 -1.4143 1994 5 -1.0608 1994 6 -1.0949 1994 7 -1.8886 1994 8 -2.2523 1994 9 -1.4280 1994 10 -0.4558 1994 11 -0.4060 1994 12 -0.5677 1995 1 -0.4179 1995 2 -1.0625 1995 3 -1.6472 1995 4 -2.0588 1995 5 -1.9809 1995 6 -1.2722 1995 7 -0.9017 1995 8 -1.5478 1995 9 -1.2897 1995 10 -1.1025 1995 11 -0.8522 1995 12 -0.9114 1996 1 -0.6740 1996 2 -0.0792 1996 3 0.0170 1996 4 -1.0257 1996 5 -1.0096 1996 6 -1.1102 1996 7 -0.9705 1996 8 -0.9298 1996 9 -0.6981 1996 10 -0.9474 1996 11 -1.3097 1996 12 -1.8368 1997 1 -1.7705 1997 2 -1.4991 1997 3 -0.7745 1997 4 -0.9582 1997 5 0.6527 1997 6 2.1720 1997 7 2.8807 1997 8 3.5215 1997 9 3.3471 1997 10 3.5407 1997 11 3.8605 1997 12 4.0572 1998 1 3.4975 1998 2 2.8550 1998 3 2.5616 1998 4 2.7934 1998 5 2.8805 1998 6 2.5282 1998 7 1.9027 1998 8 1.8306 1998 9 1.1616 1998 10 1.2596 1998 11 1.1853 1998 12 1.1457 1999 1 0.9347 1999 2 1.0414 1999 3 1.3916 1999 4 0.2025 1999 5 0.0611 1999 6 0.0485 1999 7 0.2284 1999 8 0.2373 1999 9 -0.5234 1999 10 -0.5015 1999 11 -0.3076 1999 12 -0.0616 2000 1 -0.2855 2000 2 0.6586 2000 3 1.2592 2000 4 1.6381 2000 5 0.9350 2000 6 -0.0119 2000 7 -0.5512 2000 8 -0.5686 2000 9 -0.1602 2000 10 -0.1203 2000 11 -0.5133 2000 12 0.2319 2001 1 0.5373 2001 2 1.1491 2001 3 1.2998 2001 4 0.7440 2001 5 0.0272 2001 6 -0.5571 2001 7 -1.0894 2001 8 -1.1585 2001 9 -1.9118 2001 10 -1.7933 2001 11 -2.0105 2001 12 -1.7927 2002 1 -1.9935 2002 2 -1.2912 2002 3 0.0335 2002 4 -0.7126 2002 5 -0.7096 2002 6 -0.6922 2002 7 -1.0763 2002 8 -0.9447 2002 9 -0.5625 2002 10 -0.3020 2002 11 -0.2093 2002 12 -0.2946 2003 1 -0.5293 2003 2 -0.7798 2003 3 -0.8665 2003 4 -1.2131 2003 5 -1.6706 2003 6 -1.4874 2003 7 -0.7396 2003 8 -0.3551 2003 9 -0.7058 2003 10 -0.3471 2003 11 -0.0182 2003 12 -0.0604 2004 1 -0.1505 2004 2 -0.2480 2004 3 -0.2970 2004 4 -0.5561 2004 5 -1.3414 2004 6 -1.0973 2004 7 -1.3834 2004 8 -1.4941 2004 9 -1.3684 2004 10 -0.9521 2004 11 -0.5161 2004 12 -0.7546 2005 1 -1.3759 2005 2 -1.7122 2005 3 -1.5379 2005 4 -0.9784 2005 5 -0.4869 2005 6 -0.6779 2005 7 -0.3443 2005 8 -0.4155 2005 9 -1.0486 2005 10 -1.3970 2005 11 -2.2170 2005 12 -1.7468 2006 1 -0.6969 2006 2 0.5841 2006 3 0.1330 2006 4 -0.7917 2006 5 -0.5582 2006 6 -0.8130 2006 7 -0.5891 2006 8 -0.1922 2006 9 0.1613 2006 10 0.2770 2006 11 0.0075 2006 12 0.2203 2007 1 0.3274 2007 2 -0.2768 2007 3 -1.3328 2007 4 -1.4073 2007 5 -1.6804 2007 6 -1.4466 2007 7 -1.1557 2007 8 -1.7742 2007 9 -1.3384 2007 10 -1.5056 2007 11 -1.6166 2007 12 -1.3461 2008 1 -0.0194 2008 2 1.1222 2008 3 1.0348 2008 4 1.2634 2008 5 1.2465 2008 6 1.0044 2008 7 1.4159 2008 8 1.3800 2008 9 1.2225 2008 10 1.1140 2008 11 0.2826 2008 12 0.2341 2009 1 0.6187 2009 2 0.6843 2009 3 -0.1249 2009 4 -0.0822 2009 5 0.1890 2009 6 0.3881 2009 7 0.3700 2009 8 0.1482 2009 9 -0.3063 2009 10 -0.8847 2009 11 -1.1044 2009 12 -0.9326 2010 1 -1.2396 2010 2 -0.8800 2010 3 -0.8543 2010 4 -0.8042 2010 5 -0.5882 2010 6 -0.4970 2010 7 -0.7259 2010 8 -0.4813 2010 9 -0.1794 2010 10 -0.2135 2010 11 -0.9108 2010 12 -0.6394 2011 1 -0.3278 2011 2 0.2069 2011 3 -0.3638 2011 4 -0.3555 2011 5 -0.3001 2011 6 0.0433 2011 7 -0.1961 2011 8 -0.4882 2011 9 -0.6115 2011 10 -0.8769 2011 11 -0.5347 2011 12 -0.2638 2012 1 0.3086 2012 2 0.8855 2012 3 1.1682 2012 4 1.0732 2012 5 1.1456 2012 6 1.2976 2012 7 0.8050 2012 8 0.1675 2012 9 -0.3778 2012 10 -1.0909 2012 11 -1.5801 2012 12 -1.5604 2013 1 -1.1723 2013 2 -0.4232 2013 3 0.3244 2013 4 -0.4264 2013 5 -1.1661 2013 6 -1.7953 2013 7 -1.6314 2013 8 -1.3403 2013 9 -1.1903 2013 10 -1.0498 2013 11 -0.6409 2013 12 -0.4384 2014 1 -0.2942 2014 2 -1.0350 2014 3 -0.5804 2014 4 -0.8014 2014 5 -0.2385 2014 6 0.3617 2014 7 0.3083 2014 8 -0.2924 2014 9 -0.6005 2014 10 -0.3823 2014 11 -0.4531 2014 12 -0.4840