year  ismidx-aug
1948   0.745
1949  -2.097
1950  -1.382
1951  -0.726
1952   0.928
1953   0.968
1954   0.057
1955   0.658
1956  -0.105
1957   1.157
1958   1.147
1959   0.735
1960  -0.156
1961   0.967
1962  -0.671
1963   0.822
1964   0.667
1965  -1.598
1966  -1.333
1967   0.577
1968  -1.067
1969  -1.840
1970   1.853
1971  -0.205
1972  -1.037
1973   1.423
1974  -0.671
1975   2.217
1976   0.307
1977  -0.986
1978   1.234
1979  -1.147
1980   0.240
1981  -0.170
1982   1.169
1983   1.635
1984  -0.146
1985   0.256
1986  -0.501
1987  -0.818
1988  -0.747
1989   0.566
1990   1.496
1991   0.558
1992   1.493
1993  -1.413
1994   0.567
1995  -0.652
1996  -0.003
1997   0.148
1998  -1.078
1999  -1.174
2000   0.391
2001   0.190
2002   0.182
2003  -0.110
2004  -0.120
2005  -1.269
2006   0.144
2007  -0.985
2008  -1.288