Year | Value | 2021 | 67.579129046382 | 2020 | 69.748330916133 | 2019 | 70.472754974068 | 2018 | 70.253478611392 | 2017 | 69.979289378627 | 2016 | 69.609572441708 | 2015 | 69.143783514716 | 2014 | 68.638250695356 | 2013 | 68.121401503545 | 2012 | 67.632017889654 | 2011 | 67.142436586339 | 2010 | 66.750994238682 | 2009 | 66.254591453159 | 2008 | 65.961007080358 | 2007 | 65.632276816191 | 2006 | 65.371404744022 | 2005 | 64.916298096595 | 2004 | 64.540034832497 | 2003 | 64.199772941262 | 2002 | 63.771529638231 | 2001 | 63.303707353115 | 2000 | 62.892966146414 | 1999 | 62.557148979253 | 1998 | 61.929252302663 | 1997 | 61.343990007357 | 1996 | 60.825230629744 | 1995 | 60.457692378023 | 1994 | 60.103714796845 | 1993 | 59.711417711513 | 1992 | 59.37658079705 | 1991 | 58.736641019577 | 1990 | 58.560242422689 | 1989 | 58.055779079468 | 1988 | 57.673149592129 | 1987 | 57.227228018288 | 1986 | 56.821775816615 | 1985 | 56.294031121329 | 1984 | 55.841522762278 | 1983 | 55.372779035628 | 1982 | 54.829585955288 | 1981 | 54.317389951132 | 1980 | 53.758288900355 | 1979 | 53.212730392862 | 1978 | 52.710302974092 | 1977 | 52.1965213083 | 1976 | 51.711182055224 | 1975 | 51.191198064796 | 1974 | 50.586495119566 | 1973 | 50.085818759402 | 1972 | 49.627061757563 | 1971 | 46.712437362565 | 1970 | 48.280751645597 | 1969 | 48.477083274509 | 1968 | 48.077398355187 | 1967 | 46.558278451901 | 1966 | 46.15194704095 | 1965 | 45.581710124313 | 1964 | 46.505591587698 | 1963 | 46.114925185466 | 1962 | 45.802340448361 | 1961 | 45.418648838779 | 1960 | 45.102366575861 |
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