Year | Value | 2021 | 75.361 | 2020 | 77.253 | 2019 | 76.808 | 2018 | 76.367 | 2017 | 75.1 | 2016 | 74.2 | 2015 | 74.5 | 2014 | 74.7 | 2013 | 74.3 | 2012 | 74.2 | 2011 | 73.9 | 2010 | 74.5 | 2009 | 74.2 | 2008 | 73.9 | 2007 | 73.6 | 2006 | 73.1 | 2005 | 72.6 | 2004 | 72.3 | 2003 | 72.1 | 2002 | 71.2 | 2001 | 72.1 | 2000 | 71.7 | 1999 | 70.9 | 1998 | 71.4 | 1997 | 69.3 | 1996 | 69.9 | 1995 | 68.4 | 1994 | 67.6 | 1993 | 67.9 | 1992 | 68.2 | 1991 | 66.7 | 1990 | 67.9 | 1989 | 66.5 | 1988 | 65.6 | 1987 | 66.5 | 1986 | 65.6 | 1985 | 65.4 | 1984 | 64.6 | 1983 | 66.1 | 1982 | 63.7 | 1981 | 62.8 | 1980 | 62.85 | 1979 | 62.9 | 1978 | 62.95 | 1977 | 63 | 1976 | 62.6 | 1975 | 62.2 | 1974 | 61.8 | 1973 | 61.4 | 1972 | 61 | 1971 | 60.6 | 1970 | 60.2 | 1969 | 59.8 | 1968 | 59.4 | 1967 | 59 | 1966 | 58.6 | 1965 | 58.2 | 1964 | 57.8 | 1963 | 57.4 | 1962 | 57 | 1961 | 56.6 | 1960 | 56.2 |
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