| Year | Value | | 2022 | 222.2910084923 | | 2021 | 206.49268327854 | | 2020 | 198.26530740365 | | 2019 | 188.72997716222 | | 2018 | 178.7745829248 | | 2017 | 171.79760162691 | | 2016 | 165.78444063469 | | 2015 | 152.38893046507 | | 2014 | 141.27233874902 | | 2013 | 130.36814539325 | | 2012 | 119.5597490539 | | 2011 | 109.22707546126 | | 2010 | 100 | | 2009 | 91.469128018319 | | 2008 | 82.334284298843 | | 2007 | 74.912118871869 | | 2006 | 73.249917644186 | | 2005 | 68.508873537731 | | 2004 | 64.12507040694 | | 2003 | 62.353112599401 | | 2002 | 58.986734182766 | | 2001 | 57.252332321051 | | 2000 | 55.753508664963 | | 1999 | 54.404908792173 | | 1998 | 50.632243325254 | | 1997 | 45.514392162438 | | 1996 | 43.759635754973 | | 1995 | 40.065417323029 | | 1994 | 37.227570941935 | | 1993 | 34.358851881605 | | 1992 | 31.960118969102 | | 1991 | 27.281475827069 | | 1990 | 23.608581823052 | | 1989 | 21.811388743096 | | 1988 | 20.038596749822 | | 1987 | 18.386900826699 | | 1986 | 16.602118613346 | | 1985 | 13.951483333336 | | 1984 | 12.911746691102 | | 1983 | 12.554473376308 | | 1982 | 11.171722664658 | | 1981 | 10.001672363226 | | 1980 | 8.9987721048727 | | 1979 | 7.8465458601842 | | 1978 | 7.576412378261 | | 1977 | 7.0579303726648 | | 1976 | 6.4222056828373 | | 1975 | 6.6285686506745 | | 1974 | 6.1611822743628 | | 1973 | 5.142617974784 | | 1972 | 4.6151202306282 | | 1971 | 4.2579221259928 | | 1970 | 4.3447964990579 | | 1969 | 3.7703046771711 | | 1968 | 3.6232865073772 | | 1967 | 3.5810349512398 | | 1966 | 3.6845081499364 | | 1965 | 3.2210344474754 | | 1964 | 2.9694652331672 |
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