| Year | Value | | 2022 | 161.55902413676 | | 2021 | 148.47661302671 | | 2020 | 137.16970912988 | | 2019 | 132.1722348987 | | 2018 | 129.82167868952 | | 2017 | 125.35353436434 | | 2016 | 121.37303651383 | | 2015 | 119.44499591454 | | 2014 | 118.45383775457 | | 2013 | 115.00524196631 | | 2012 | 109.70542659874 | | 2011 | 105.79676809206 | | 2010 | 100 | | 2009 | 94.04689529053 | | 2008 | 92.709878554718 | | 2007 | 83.790678332936 | | 2006 | 78.94089209025 | | 2005 | 73.38368829855 | | 2004 | 70.432426911535 | | 2003 | 46.502064618423 | | 2002 | 36.486598218932 | | 2001 | 34.675375838371 | | 2000 | 31.846435189463 | | 1999 | 29.562952623208 | | 1998 | 27.766321185563 | | 1997 | 26.486578297095 | | 1996 | 24.45744948045 | | 1995 | 23.204566735681 | | 1994 | 20.619690672985 | | 1993 | 19.046318492492 | | 1992 | 18.096206348023 | | 1991 | 17.356968480135 | | 1990 | 11.801106822829 | | 1989 | 7.8432223652079 | | 1988 | 5.5760973727607 | | 1987 | 3.8759549788278 | | 1986 | 3.4134128341114 | | 1985 | 3.1711681648146 | | 1984 | 2.1819537721725 | | 1983 | 1.8159994155548 | | 1982 | 1.7192304120937 | | 1981 | 1.5971113929528 | | 1980 | 1.4854827297842 | | 1979 | 1.2723279088042 | | 1978 | 1.1654150070598 | | 1977 | 1.1262458615121 | | 1976 | 0.99797134073447 | | 1975 | 0.92605785292129 | | 1974 | 0.80877196121364 | | 1973 | 0.71483690627458 | | 1972 | 0.62116770526635 | | 1971 | 0.57176318344812 | | 1970 | 0.55200137472243 | | 1969 | 0.53170785813815 | | 1968 | 0.52666958903342 | | 1967 | 0.52648018042128 | | 1966 | 0.5200402875807 | | 1965 | 0.5186765455678 | | 1964 | 0.52867732032906 | | 1963 | 0.51776738422587 | | 1962 | 0.47685512383892 | | 1961 | 0.4368520247939 | | 1960 | 0.45458067096612 |
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