year  wymidx-jul
1948   1.939
1949   0.019
1950   1.162
1951  -1.178
1952   0.644
1953  -0.110
1954   0.561
1955   0.517
1956  -0.585
1957  -0.219
1958   1.689
1959  -0.371
1960  -0.877
1961   1.078
1962   0.461
1963  -0.775
1964  -0.795
1965   1.066
1966  -0.550
1967   1.182
1968   1.247
1969   2.119
1970   1.812
1971  -0.405
1972  -1.169
1973  -0.456
1974  -1.014
1975  -0.919
1976   0.462
1977   0.249
1978  -0.905
1979  -0.492
1980   0.432
1981   1.967
1982  -0.058
1983  -0.832
1984  -0.928
1985   0.606
1986   0.672
1987  -1.003
1988   0.426
1989  -0.820
1990   1.095
1991   0.268
1992  -1.643
1993  -0.304
1994   1.222
1995   0.653
1996  -0.353
1997  -0.417
1998  -0.055
1999   1.854
2000  -0.773
2001  -0.558
2002  -0.953
2003  -1.030
2004  -1.389
2005  -0.059
2006   0.158
2007  -2.231
2008  -1.337