year  wymidx-sep
1948   1.754
1949   1.227
1950   1.261
1951  -0.542
1952   0.720
1953   0.842
1954   2.183
1955   0.572
1956   1.340
1957   0.035
1958   1.828
1959   0.855
1960   1.262
1961   2.291
1962   0.473
1963  -0.196
1964   1.580
1965  -0.089
1966  -0.561
1967   0.769
1968  -0.105
1969  -0.690
1970   0.662
1971  -0.075
1972  -2.706
1973   0.582
1974  -0.993
1975   0.206
1976  -0.883
1977  -1.014
1978   0.307
1979  -1.433
1980  -0.242
1981   0.205
1982  -0.622
1983   0.401
1984  -1.206
1985   0.034
1986  -0.839
1987  -1.398
1988   0.115
1989  -0.402
1990   0.089
1991  -0.498
1992  -0.192
1993   0.328
1994  -1.396
1995  -0.099
1996  -0.132
1997  -2.359
1998   0.457
1999   0.117
2000  -0.872
2001  -0.577
2002  -1.281
2003  -0.098
2004  -0.955
2005   0.370
2006  -0.569
2007   0.165