year  wnpmidx-aug
1948   1.504
1949  -0.624
1950  -0.869
1951   0.825
1952   0.887
1953   1.156
1954  -0.184
1955  -1.726
1956  -0.327
1957   0.247
1958  -1.442
1959  -0.258
1960   0.622
1961   0.834
1962  -0.539
1963  -0.631
1964   0.206
1965  -1.248
1966  -1.095
1967   1.436
1968   0.765
1969  -1.665
1970  -0.002
1971  -1.727
1972   0.113
1973   0.486
1974   0.327
1975   0.401
1976  -0.209
1977  -0.534
1978   1.605
1979   0.384
1980  -0.680
1981   0.641
1982   0.276
1983  -0.628
1984   1.785
1985   0.688
1986   1.774
1987  -1.031
1988  -2.640
1989   0.016
1990   0.823
1991   0.485
1992   0.745
1993  -0.015
1994   0.205
1995  -0.716
1996  -1.434
1997   0.840
1998  -2.010
1999  -1.046
2000  -0.002
2001   1.445
2002   0.598
2003   0.105
2004   1.330
2005   0.103
2006   0.797
2007   0.209
2008  -1.380