year  ismidx-jun
1948  -0.034
1949  -0.519
1950  -1.411
1951   0.877
1952   0.449
1953  -0.615
1954   0.260
1955   0.689
1956   0.815
1957   0.052
1958  -0.249
1959   0.656
1960   0.918
1961  -0.044
1962  -2.008
1963  -1.069
1964  -0.720
1965  -1.601
1966  -1.247
1967  -0.534
1968  -1.216
1969  -0.956
1970   1.453
1971   0.219
1972  -1.140
1973  -0.253
1974  -1.721
1975   1.325
1976  -1.139
1977   1.023
1978   1.657
1979  -0.225
1980   2.460
1981  -0.248
1982  -0.679
1983  -0.600
1984   0.816
1985  -0.844
1986   0.692
1987   0.473
1988   0.317
1989   0.644
1990   0.170
1991  -0.448
1992  -0.589
1993   0.088
1994   1.645
1995  -1.280
1996   0.962
1997  -2.347
1998   0.897
1999  -0.677
2000   0.525
2001   0.844
2002   0.925
2003  -0.661
2004   0.952
2005   0.588
2006   0.181
2007   1.500