1955  -31.5253  8.74892
1956  -26.6825  8.69323
1957  -33.0604  8.52599
1958  -26.0663  8.49867
1959  -32.371  8.50807
1960  -18.1298  8.39469
1961  -20.9921  8.44245
1962  -16.5048  8.38276
1963  -14.2597  8.32018
1964  -6.74404  8.23223
1965  -2.81729  8.27941
1966  -1.61318  8.37928
1967  -9.71084  8.23271
1968  -18.5683  8.26165
1969  -14.8651  8.17859
1970  -7.64053  8.10884
1971  -1.20889  8.02046
1972  -11.6376  8.11359
1973  -2.5751  8.09251
1974  -7.70107  8.21701
1975  3.37803  8.19156
1976  6.90439  8.12671
1977  5.48838  8.10816
1978  4.00693  8.11837
1979  -0.656152  8.06509
1980  12.7276  8.11526
1981  8.71104  8.04063
1982  -1.90518  8.12518
1983  6.7999  7.96913
1984  9.546  8.09615
1985  11.7804  8.0051
1986  15.2208  8.01093
1987  7.02354  7.94308
1988  14.3771  8.02739
1989  18.2511  8.04349
1990  15.1847  8.27086
1991  17.2911  8.22614
1992  30.837  8.17805
1993  32.6466  8.15441
1994  34.2989  8.19448
1995  28.9073  8.08301
1996  33.2169  8.07137
1997  39.0499  7.9494
1998  28.1065  7.8926
1999  35.3116  7.92775
2000  31.6397  7.9507
2001  42.7062  7.93072
2002  49.1915  7.59061
2003  60.9737  7.10052
2004  61.8321  6.73412
2005  68.8604  6.43094
2006  72.1056  6.35049
2007  69.5978  6.2858
2008  74.3985  6.22781
2009  77.5353  6.18754
2010  81.9376  6.12951
2011  87.0558  6.10245
2012  91.5138  6.08195
2013  101.799  6.29461
2014  108.028  6.3101
2015  113.018  6.26266
2016  111.909  6.23849
2017  117.48  5.75298
2018  110.354  6.37433