year  wnpmidx-sep
1948   1.722
1949   0.946
1950   0.988
1951  -1.033
1952   0.388
1953   0.061
1954   0.647
1955  -1.934
1956   0.834
1957   0.373
1958   0.656
1959  -0.560
1960   0.095
1961   1.414
1962   0.511
1963   0.037
1964   0.581
1965   0.490
1966   0.261
1967   0.390
1968   1.634
1969   1.449
1970  -0.446
1971  -0.610
1972  -0.768
1973  -1.928
1974  -2.257
1975  -1.387
1976   0.490
1977   1.954
1978   0.491
1979  -1.482
1980   0.638
1981  -1.608
1982   0.743
1983  -1.703
1984  -1.537
1985   0.572
1986   0.053
1987  -0.058
1988  -1.418
1989  -0.267
1990   0.446
1991   1.060
1992   0.000
1993  -0.293
1994   0.736
1995  -0.195
1996   0.784
1997  -1.558
1998  -0.611
1999  -0.237
2000  -0.625
2001  -0.655
2002   0.426
2003   1.049
2004  -1.443
2005   1.182
2006  -0.383
2007   0.735
2008   0.162