year  wymidx-jul
1948   1.930
1949  -0.003
1950   1.148
1951  -1.209
1952   0.626
1953  -0.133
1954   0.542
1955   0.498
1956  -0.612
1957  -0.243
1958   1.678
1959  -0.396
1960  -0.905
1961   1.063
1962   0.441
1963  -0.803
1964  -0.823
1965   1.051
1966  -0.576
1967   1.168
1968   1.233
1969   2.112
1970   1.802
1971  -0.430
1972  -1.199
1973  -0.481
1974  -1.044
1975  -0.948
1976   0.443
1977   0.229
1978  -0.933
1979  -0.517
1980   0.413
1981   1.958
1982  -0.081
1983  -0.860
1984  -0.957
1985   0.588
1986   0.654
1987  -1.033
1988   0.406
1989  -0.848
1990   1.081
1991   0.247
1992  -1.676
1993  -0.329
1994   1.208
1995   0.635
1996  -0.378
1997  -0.442
1998  -0.078
1999   1.845
2000  -0.801
2001  -0.584
2002  -0.982
2003  -1.059
2004  -1.421
2005  -0.082
2006   0.137
2007  -2.269