year  ismidx-jun
1948  -0.026
1949  -0.887
1950  -1.379
1951   0.878
1952   0.323
1953  -0.729
1954   0.101
1955   0.669
1956   0.502
1957   0.016
1958  -0.029
1959   0.441
1960   0.818
1961  -0.077
1962  -2.096
1963  -1.088
1964  -0.880
1965  -1.548
1966  -1.087
1967  -0.748
1968  -1.150
1969  -0.747
1970   1.642
1971   0.578
1972  -1.291
1973  -0.470
1974  -1.688
1975   1.385
1976  -1.365
1977   0.968
1978   1.411
1979  -0.353
1980   2.627
1981  -0.192
1982  -0.622
1983  -0.682
1984   0.906
1985  -0.662
1986   0.561
1987   0.190
1988   0.317
1989   0.544
1990   0.489
1991  -0.019
1992  -0.188
1993   0.184
1994   1.693
1995  -1.159
1996   0.964
1997  -2.318
1998   0.851
1999  -0.590
2000   0.970
2001   1.093
2002   0.965
2003  -0.739
2004   1.001
2005   0.575
2006   0.144
2007   1.273
2008  -0.270