Year | Value | 2021 | 76.8 | 2020 | 76.6 | 2019 | 76.4 | 2018 | 76.3 | 2017 | 76.1 | 2016 | 75.9 | 2015 | 75.7 | 2014 | 75.6 | 2013 | 75.4 | 2012 | 75.2 | 2011 | 75 | 2010 | 74.5 | 2009 | 74.1 | 2008 | 73.7 | 2007 | 73.4 | 2006 | 75.3 | 2005 | 74.3 | 2004 | 74.7 | 2003 | 74.4 | 2002 | 74.4 | 2001 | 74.5 | 2000 | 73.4 | 1999 | 68.511 | 1998 | 68.639 | 1997 | 68.395 | 1996 | 68.88 | 1995 | 68.609 | 1994 | 68.6 | 1993 | 68.466 | 1992 | 68.302 | 1991 | 68.103 | 1990 | 67.949 | 1989 | 67.701 | 1988 | 67.454 | 1987 | 66.874 | 1986 | 66.7 | 1985 | 66.475 | 1984 | 66.251 | 1983 | 66.067 | 1982 | 65.823 | 1981 | 65.236 | 1980 | 65.095 | 1979 | 64.949 | 1978 | 64.794 | 1977 | 64.635 | 1976 | 64.433 | 1975 | 64.22 | 1974 | 64.031 | 1973 | 63.81 | 1972 | 63.225 | 1971 | 62.632 | 1970 | 62.586 | 1969 | 62.587 | 1968 | 62.504 | 1967 | 61.882 | 1966 | 61.789 | 1965 | 61.693 | 1964 | 61.561 | 1963 | 60.863 | 1962 | 60.962 | 1961 | 60.906 | 1960 | 60.605 |
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