Year | Value | 2021 | 62.303142045018 | 2020 | 61.458093262656 | 2019 | 61.204578627948 | 2018 | 59.708842283168 | 2017 | 59.59383882615 | 2016 | 59.646692786356 | 2015 | 59.401090881155 | 2014 | 58.915264653914 | 2013 | 58.984405008835 | 2012 | 58.922946915572 | 2011 | 58.984405008835 | 2010 | 59.85250057617 | 2009 | 59.890911884459 | 2008 | 59.944687716064 | 2007 | 60.044557117615 | 2006 | 60.536221863717 | 2005 | 60.77437197511 | 2004 | 62.556656679727 | 2003 | 63.209648920642 | 2002 | 63.401705462088 | 2001 | 63.78581854498 | 2000 | 64.146884842898 | 1999 | 64.807559345471 | 1998 | 64.945840055312 | 1997 | 64.454175309211 | 1996 | 64.200660674503 | 1995 | 64.561726972421 | 1994 | 64.592456019052 | 1993 | 65.34531766152 | 1992 | 66.136590612276 | 1991 | 72.098025658754 | 1990 | 72.64346623646 | 1989 | 73.38864561727 | 1988 | 73.265729430744 | 1987 | 70.945686410079 | 1986 | 70.3771990474 | 1985 | 70.308058692479 | 1984 | 70.561573327188 | 1983 | 69.824076208036 | 1982 | 69.939310132903 | 1981 | 69.977721441192 | 1980 | 70.069908581086 | 1979 | 70.046861796113 | 1978 | 70.100637627718 | 1977 | 70.146731197665 | 1976 | 70.200507029269 | 1975 | 70.246600599216 | 1974 | 70.146731197665 | 1973 | 70.146731197665 | 1972 | 70.16209572098 | 1971 | 67.888146270262 | 1970 | 67.888146270262 | 1969 | 67.6807252055 | 1968 | 67.826688176999 | 1967 | 67.934239840209 | 1966 | 67.588538065606 | 1965 | 67.427210570792 | 1964 | 66.374740723669 | 1963 | 66.105861565645 | 1962 | 66.044403472382 | 1961 | 66.105861565645 |
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