| Year | Value | | 2022 | 121.77108475204 | | 2021 | 112.54125052622 | | 2020 | 110.47125857849 | | 2019 | 110.62359564824 | | 2018 | 109.95152034053 | | 2017 | 108.71490177436 | | 2016 | 107.39763417126 | | 2015 | 107.49870085603 | | 2014 | 107.45701784934 | | 2013 | 107.19861833504 | | 2012 | 105.90656520528 | | 2011 | 102.78063272879 | | 2010 | 100 | | 2009 | 98.497406286648 | | 2008 | 97.740146777842 | | 2007 | 94.57396863973 | | 2006 | 92.874603821687 | | 2005 | 90.972510623427 | | 2004 | 89.201597564227 | | 2003 | 87.275653757447 | | 2002 | 85.003877919331 | | 2001 | 82.95867838165 | | 2000 | 80.710750463752 | | 1999 | 78.713255727513 | | 1998 | 77.425316594739 | | 1997 | 75.940612629978 | | 1996 | 74.420129168035 | | 1995 | 71.553016476948 | | 1994 | 67.993280895748 | | 1993 | 65.345581078417 | | 1992 | 62.455911747802 | | 1991 | 59.328927249434 | | 1990 | 55.838990721391 | | 1989 | 52.45234768764 | | 1988 | 49.362347941505 | | 1987 | 46.985695199672 | | 1986 | 44.856241613116 | | 1985 | 42.387769942744 | | 1984 | 38.814509518052 | | 1983 | 35.032886033762 | | 1982 | 30.557289236041 | | 1981 | 26.233843119181 | | 1980 | 22.237856286947 | | 1979 | 18.368652429059 | | 1978 | 16.000767133639 | | 1977 | 14.274417147842 | | 1976 | 12.186810554346 | | 1975 | 10.450540378567 | | 1974 | 8.9358661563638 | | 1973 | 7.4990629702035 | | 1972 | 6.7681918262793 | | 1971 | 6.400211418762 | | 1970 | 6.1075577493926 | | 1969 | 5.8184771907991 | | 1968 | 5.6678676234235 | | 1967 | 5.5963842599354 | | 1966 | 5.39497171356 | | 1965 | 5.2712765220071 | | 1964 | 5.0433538307043 | | 1963 | 4.7618196921058 | | 1962 | 4.4314663615958 | | 1961 | 4.2328951704014 | | 1960 | 4.1478356168675 |
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