year  ismidx-jul
1948  -0.504
1949  -2.235
1950   0.521
1951  -0.569
1952   0.507
1953   0.502
1954   0.495
1955  -1.872
1956   0.850
1957   0.444
1958   0.651
1959   1.885
1960  -0.182
1961   1.442
1962   0.989
1963  -0.647
1964  -0.402
1965  -0.575
1966  -0.064
1967   1.300
1968   0.971
1969   1.002
1970  -0.724
1971  -0.183
1972  -1.044
1973   1.283
1974  -0.682
1975  -1.268
1976   0.475
1977   0.805
1978   0.101
1979  -0.322
1980   0.280
1981  -0.377
1982  -0.593
1983   0.196
1984  -0.449
1985  -1.336
1986  -0.706
1987  -2.954
1988   0.654
1989  -0.221
1990  -1.687
1991   1.029
1992   0.324
1993   0.770
1994   1.220
1995   0.515
1996   0.494
1997   0.676
1998  -0.069
1999  -0.176
2000  -0.121
2001  -0.091
2002  -2.693
2003   1.833
2004  -0.190
2005   0.745
2006   0.424
2007  -0.449