year  wnpmidx-jul
1948   0.581
1949  -0.348
1950   1.029
1951  -0.884
1952   0.191
1953  -0.624
1954  -2.089
1955  -1.096
1956  -0.258
1957  -1.037
1958   0.496
1959  -0.512
1960  -1.211
1961   0.532
1962   1.432
1963   0.349
1964  -1.166
1965   1.535
1966  -0.184
1967   0.661
1968  -0.396
1969   1.044
1970  -0.619
1971   1.071
1972   2.396
1973  -0.076
1974  -0.799
1975  -1.154
1976   0.389
1977   0.619
1978   0.139
1979   0.071
1980  -0.211
1981   0.207
1982   1.177
1983  -1.367
1984  -1.442
1985  -0.488
1986   0.771
1987   0.002
1988  -0.727
1989   0.099
1990   0.579
1991  -0.082
1992  -0.886
1993  -0.694
1994   2.250
1995  -0.708
1996   0.423
1997   0.439
1998  -2.517
1999   0.584
2000   0.854
2001   1.200
2002   1.669
2003  -0.783
2004  -0.733
2005   0.283
2006   1.371
2007  -1.350