| Year | Value | | 2022 | -14.257037489683 | | 2021 | 0.70297185796756 | | 2020 | 0.57424247013594 | | 2019 | 0.53099416011376 | | 2018 | 0.46642562089681 | | 2017 | 0.38634531089475 | | 2016 | 0.33133379637195 | | 2015 | 0.26124967971181 | | 2014 | 0.4792620003446 | | 2013 | 0.22769135005053 | | 2012 | 0.24697648118688 | | 2011 | 0.35960009278876 | | 2010 | 0.39726316765691 | | 2009 | 0.44384132403 | | 2008 | 0.54149674097473 | | 2007 | 0.59687108011882 | | 2006 | 0.67605967262671 | | 2005 | 0.73280094370521 | | 2004 | 0.75857102733617 | | 2003 | 0.8113762164528 | | 2002 | 0.94963934071408 | | 2001 | -1.0509209150428 | | 2000 | -1.0065790270293 | | 1999 | 0.94271800218794 | | 1998 | 0.89360138243108 | | 1997 | 0.91134730893454 | | 1996 | 0.88719961568856 | | 1995 | 0.79007161160151 | | 1994 | 0.49529114532396 | | 1993 | 0.055209644686726 | | 1992 | 0.28785176797173 | | 1991 | 0.21002607538066 | | 1990 | 0.22842953122636 | | 1989 | 0.4879286308129 | | 1988 | 0.44352009210616 | | 1987 | 0.38285035531749 | | 1986 | 0.35289310643691 | | 1985 | 0.32064234570778 | | 1984 | 0.37505719166213 | | 1983 | 0.35661962746422 | | 1982 | 0.32403984419751 | | 1981 | 0.49319965691495 | | 1980 | 0.46971787951899 | | 1979 | 0.40919974489822 | | 1978 | 0.36237813123115 | | 1977 | 0.43226616139548 | | 1976 | 0.51480415127974 | | 1975 | 0.59386471953967 | | 1974 | 0.62153516345239 | | 1973 | 0.68005144104263 | | 1972 | 0.78774781549893 | | 1971 | 0.67175759992737 | | 1970 | 0.61143094150153 | | 1969 | 0.75981968327527 | | 1968 | 0.86104454289125 | | 1967 | 0.92618916584013 | | 1966 | 0.92554725264195 | | 1965 | 0.98681729810921 | | 1964 | 1.1086765693825 | | 1963 | 1.1794730364918 | | 1962 | 1.282034208904 | | 1961 | 1.3885068130017 |
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