1955  -29.3516  8.40321
1956  -24.8096  8.34635
1957  -31.3936  8.17695
1958  -24.9004  8.15722
1959  -31.3281  8.159
1960  -17.2031  8.0398
1961  -19.4473  8.08804
1962  -16.3369  8.03128
1963  -14.2285  7.97059
1964  -6.90723  7.88094
1965  -3.34473  7.92821
1966  -1.5127  8.03055
1967  -9.62012  7.87887
1968  -18.6641  7.91485
1969  -15.6094  7.82823
1970  -7.62402  7.75584
1971  -2.11328  7.6666
1972  -12.1826  7.7589
1973  -2.7207  7.73723
1974  -7.81152  7.86652
1975  3.37891  7.84068
1976  6.83789  7.77436
1977  6.13086  7.7523
1978  4.05469  7.77008
1979  -0.583984  7.70407
1980  12.7754  7.76331
1981  8.71191  7.68844
1982  -1.37988  7.77085
1983  6.97559  7.61518
1984  10.0742  7.74863
1985  12.2197  7.65161
1986  15.418  7.66028
1987  7.4834  7.58807
1988  13.7891  7.67478
1989  17.958  7.6907
1990  14.3262  7.91661
1991  16.6143  7.8663
1992  27.8438  7.82162
1993  29.8154  7.80028
1994  32.0713  7.84116
1995  27.4482  7.72574
1996  31.5244  7.72058
1997  37.3213  7.59245
1998  25.6133  7.53508
1999  32.6846  7.56768
2000  28.8057  7.58894
2001  39.5059  7.5685
2002  46.4326  7.22275
2003  56.7803  6.73304
2004  58.1465  6.36001
2005  62.0742  6.06889
2006  63.3008  5.99929
2007  63.6855  5.93563
2008  66.9014  5.88128
2009  68.2168  5.84197
2010  73.915  5.78258
2011  77.835  5.75759
2012  82.6367  5.73201
2013  91.6836  5.94088
2014  99.1016  5.95731
2015  104.512  5.91403
2016  103.484  5.89344
2017  109.299  5.89573