year  wnpmidx-jul
1948   0.590
1949  -0.346
1950   1.041
1951  -0.886
1952   0.197
1953  -0.624
1954  -2.100
1955  -1.100
1956  -0.255
1957  -1.040
1958   0.505
1959  -0.511
1960  -1.216
1961   0.540
1962   1.447
1963   0.356
1964  -1.171
1965   1.551
1966  -0.181
1967   0.670
1968  -0.394
1969   1.056
1970  -0.619
1971   1.084
1972   2.419
1973  -0.072
1974  -0.801
1975  -1.159
1976   0.396
1977   0.628
1978   0.145
1979   0.076
1980  -0.208
1981   0.213
1982   1.191
1983  -1.373
1984  -1.448
1985  -0.487
1986   0.781
1987   0.007
1988  -0.728
1989   0.104
1990   0.588
1991  -0.078
1992  -0.889
1993  -0.695
1994   2.272
1995  -0.709
1996   0.431
1997   0.447
1998  -2.531
1999   0.593
2000   0.866
2001   1.214
2002   1.686
2003  -0.785
2004  -0.734
2005   0.290
2006   1.386
2007  -1.355
2008  -0.277