year  ismidx-aug
1948   0.571
1949  -2.040
1950  -1.513
1951  -0.967
1952   0.598
1953   0.915
1954   0.442
1955   0.580
1956  -0.163
1957   1.151
1958   1.275
1959   0.756
1960  -0.099
1961   1.178
1962  -0.615
1963   0.844
1964   0.841
1965  -1.630
1966  -1.709
1967   0.547
1968  -1.284
1969  -1.811
1970   1.893
1971  -0.291
1972  -1.284
1973   1.353
1974  -0.416
1975   2.307
1976   0.275
1977  -1.090
1978   1.090
1979  -0.816
1980   0.293
1981  -0.104
1982   1.172
1983   1.564
1984  -0.231
1985   0.467
1986  -0.508
1987  -0.934
1988  -0.518
1989   0.296
1990   1.300
1991   0.473
1992   1.527
1993  -1.305
1994   0.444
1995  -0.976
1996  -0.229
1997   0.099
1998  -1.035
1999  -1.251
2000   0.330
2001   0.169
2002   0.011
2003  -0.117
2004  -0.136
2005  -0.962
2006   0.092
2007  -0.820