| Year | Value | | 2022 | 228.73827961892 | | 2021 | 212.46973827874 | | 2020 | 200.23364228346 | | 2019 | 189.96631501782 | | 2018 | 180.51481218302 | | 2017 | 172.42823857622 | | 2016 | 159.64731693831 | | 2015 | 150.18963879765 | | 2014 | 140.91440678482 | | 2013 | 131.84584520042 | | 2012 | 124.71525832444 | | 2011 | 114.02249396385 | | 2010 | 100 | | 2009 | 96.189557552659 | | 2008 | 88.058156495554 | | 2007 | 69.75466127579 | | 2006 | 63.552635676898 | | 2005 | 55.526921962465 | | 2004 | 50.335892894049 | | 2003 | 45.094134653552 | | 2002 | 41.063471344519 | | 2001 | 40.273582266096 | | 2000 | 38.087872331608 | | 1999 | 34.631627223621 | | 1998 | 32.751060945442 | | 1997 | 30.688074614122 | | 1996 | 27.557081691834 | | 1995 | 25.313289576009 | | 1994 | 24.925859916074 | | 1993 | 19.350213921162 | | 1992 | 13.255488566812 | | 1991 | 10.410148766435 | | 1990 | 8.6690198568499 | | 1989 | 7.3602362969268 | | 1988 | 6.4683016588009 | | 1987 | 5.7616387902129 | | 1986 | 5.3035366287225 | | 1985 | 5.1724524092754 | | 1984 | 4.577125536197 | | 1983 | 4.1503041783514 | | 1982 | 3.7256613878531 | | 1981 | 3.0875634578739 | | 1980 | 2.7665582283275 | | 1979 | 2.429828223974 | | 1978 | 2.2502711537446 | | 1977 | 1.9244307291283 | | 1976 | 1.6760273159278 | | 1975 | 1.503850960847 | | 1974 | 1.2624652768126 | | 1973 | 1.0716117763306 | | 1972 | 0.98060035301292 | | 1971 | 0.92656629819292 | | 1970 | 0.89281601259579 | | 1969 | 0.87369496211096 | | 1968 | 0.87519593194363 | | 1967 | 0.87199821360371 | | 1966 | 0.85692325571438 | | 1965 | 0.81600551286856 | | 1964 | 0.78781338381729 | | 1963 | 0.78859649852077 | | 1962 | 0.78313278144095 | | 1961 | 0.75945667409506 | | 1960 | 0.74124428382899 |
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