| Year | Value | | 2022 | 125.26927574353 | | 2021 | 118.99110598777 | | 2020 | 114.31345442114 | | 2019 | 111.60697787703 | | 2018 | 112.85614124419 | | 2017 | 112.45197867686 | | 2016 | 111.68594592118 | | 2015 | 110.88405631311 | | 2014 | 109.51349541321 | | 2013 | 109.02432281741 | | 2012 | 106.28102840072 | | 2011 | 104.91243395052 | | 2010 | 100 | | 2009 | 98.78840357714 | | 2008 | 97.791415618689 | | 2007 | 91.988307751237 | | 2006 | 90.280200672728 | | 2005 | 88.106445939908 | | 2004 | 84.810840517545 | | 2003 | 83.592077757299 | | 2002 | 80.924163877751 | | 2001 | 78.508256883103 | | 2000 | 75.227200607353 | | 1999 | 73.370361712906 | | 1998 | 72.858620390728 | | 1997 | 69.646890532182 | | 1996 | 66.954751563084 | | 1995 | 65.333942739535 | | 1994 | 57.162520887787 | | 1993 | 45.337728570027 | | 1992 | 44.377091223975 | | 1991 | 42.575556031097 | | 1990 | 41.870725797025 | | 1989 | 42.210894828913 | | 1988 | 41.772484980615 | | 1987 | 39.065011622013 | | 1986 | 36.528711320256 | | 1985 | 33.303908897958 | | 1984 | 32.694546863905 | | 1983 | 31.351221902325 | | 1982 | 29.677295299956 | | 1981 | 27.585455481679 | | 1980 | 25.354462840726 | | 1979 | 22.104835157826 | | 1978 | 18.999817271053 | | 1977 | 16.777919585828 | | 1976 | 13.167222160401 | | 1975 | 11.748409066253 | | 1974 | 10.541963188447 | | 1973 | 8.9826330282918 | | 1972 | 8.0849608975738 | | 1971 | 8.0599497693164 | | 1970 | 8.0958748444653 | | 1969 | 7.4819653325596 | | 1968 | 7.1631871341807 | | 1967 | 6.7993889049167 | | 1966 | 6.6470483963942 | | 1965 | 6.3796566978943 | | 1964 | 6.2173117380898 | | 1963 | 6.1791129240216 | | 1962 | 6.1213599551032 | | 1961 | 6.2045788000837 | | 1960 | 5.5588369431265 |
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