Year | Value | 2021 | 74.237507617519 | 2020 | 74.745873494982 | 2019 | 76.699717940194 | 2018 | 76.567639221345 | 2017 | 76.4700936461 | 2016 | 76.484980105937 | 2015 | 76.655663593235 | 2014 | 76.827645729601 | 2013 | 76.735025599763 | 2012 | 76.721211426405 | 2011 | 76.608461133688 | 2010 | 76.499672858965 | 2009 | 76.289167779925 | 2008 | 75.888268933091 | 2007 | 75.7760045842 | 2006 | 75.505483230258 | 2005 | 75.278774937901 | 2004 | 75.26541729719 | 2003 | 74.779342882599 | 2002 | 74.673601346548 | 2001 | 74.558776347028 | 2000 | 74.350609762913 | 1999 | 74.127538478972 | 1998 | 74.015672540464 | 1997 | 73.810047107142 | 1996 | 73.332688174961 | 1995 | 72.756635787693 | 1994 | 72.653836327952 | 1993 | 72.450266415544 | 1992 | 72.547090503056 | 1991 | 72.254865155911 | 1990 | 72.052169652208 | 1989 | 71.923346388995 | 1988 | 71.620923425853 | 1987 | 71.612149412385 | 1986 | 71.400429167039 | 1985 | 71.290690097224 | 1984 | 71.290055095127 | 1983 | 71.166956234423 | 1982 | 70.951965587418 | 1981 | 70.559852831971 | 1980 | 70.157598276025 | 1979 | 70.130581090096 | 1978 | 69.730667857772 | 1977 | 69.612818174584 | 1976 | 69.218744150883 | 1975 | 68.917623900229 | 1974 | 68.351730100823 | 1973 | 67.803120355333 | 1972 | 67.604218548022 | 1971 | 67.614551408753 | 1970 | 67.313249735003 | 1969 | 67.026316165132 | 1968 | 66.295745786686 | 1967 | 67.18204048988 | 1966 | 66.894762946406 | 1965 | 66.983181390508 | 1964 | 66.969991661164 | 1963 | 66.766961151745 | 1962 | 67.041666446469 | 1961 | 67.217668543032 | 1960 | 66.751936916425 |
|