year  wnpmidx-sep
1948   1.711
1949   0.941
1950   0.983
1951  -1.022
1952   0.388
1953   0.063
1954   0.645
1955  -1.916
1956   0.830
1957   0.373
1958   0.654
1959  -0.553
1960   0.097
1961   1.405
1962   0.509
1963   0.039
1964   0.579
1965   0.489
1966   0.261
1967   0.389
1968   1.624
1969   1.440
1970  -0.440
1971  -0.602
1972  -0.759
1973  -1.910
1974  -2.236
1975  -1.374
1976   0.488
1977   1.941
1978   0.489
1979  -1.467
1980   0.635
1981  -1.592
1982   0.740
1983  -1.686
1984  -1.522
1985   0.570
1986   0.056
1987  -0.055
1988  -1.404
1989  -0.262
1990   0.445
1991   1.054
1992   0.002
1993  -0.288
1994   0.732
1995  -0.191
1996   0.780
1997  -1.543
1998  -0.603
1999  -0.233
2000  -0.617
2001  -0.647
2002   0.425
2003   1.043
2004  -1.429
2005   1.175
2006  -0.377
2007   0.732