Year | Value | 2021 | 81.1 | 2020 | 83.1 | 2019 | 81.4 | 2018 | 81.2 | 2017 | 80.9 | 2016 | 80.7 | 2015 | 80.5 | 2014 | 80.3 | 2013 | 80.1 | 2012 | 79.8 | 2011 | 79.5 | 2010 | 79.2 | 2009 | 78.9 | 2008 | 78.4 | 2007 | 78.1 | 2006 | 77.8 | 2005 | 77.6 | 2004 | 77.1 | 2003 | 76.6 | 2002 | 76.6 | 2001 | 76.3 | 2000 | 76 | 1999 | 75.6 | 1998 | 75.3 | 1997 | 74.8 | 1996 | 74.4 | 1995 | 74.1 | 1994 | 74.1 | 1993 | 73.9 | 1992 | 73.8 | 1991 | 73.5 | 1990 | 73.1 | 1989 | 72.8 | 1988 | 72.6 | 1987 | 72.5 | 1986 | 72.1 | 1985 | 71.5 | 1984 | 70.9 | 1983 | 70.5 | 1982 | 70.2 | 1981 | 70.1 | 1980 | 69.8 | 1979 | 68.868 | 1978 | 68.677 | 1977 | 68.396 | 1976 | 68.048 | 1975 | 67.721 | 1974 | 67.115 | 1973 | 66.712 | 1972 | 66.218 | 1971 | 66.042 | 1970 | 65.898 | 1969 | 65.637 | 1968 | 65.299 | 1967 | 65.112 | 1966 | 64.897 | 1965 | 64.513 | 1964 | 64.15 | 1963 | 63.843 | 1962 | 63.696 | 1961 | 63.016 | 1960 | 62.182 |
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