Year | Value | 2021 | 81.8 | 2020 | 81.6 | 2019 | 81.7 | 2018 | 81.3 | 2017 | 81.1 | 2016 | 80.4 | 2015 | 81.2 | 2014 | 81.3 | 2013 | 80.5 | 2012 | 81.6 | 2011 | 80.7 | 2010 | 79.8 | 2009 | 79.8 | 2008 | 80 | 2007 | 79.6 | 2006 | 79.5 | 2005 | 79.6 | 2004 | 78.9 | 2003 | 79.5 | 2002 | 78.6 | 2001 | 78.3 | 2000 | 77.8 | 1999 | 77.4 | 1998 | 77.7 | 1997 | 76.3 | 1996 | 76.49 | 1995 | 75.96 | 1994 | 77.13 | 1993 | 77.12 | 1992 | 76.77 | 1991 | 74.87 | 1990 | 75.49 | 1989 | 76.18 | 1988 | 74.4 | 1987 | 74.9 | 1986 | 75.42 | 1985 | 74.9 | 1984 | 74.84 | 1983 | 73.27 | 1982 | 74.55 | 1981 | 73.38 | 1980 | 73.51 | 1979 | 73.7 | 1978 | 73.82 | 1977 | 73.32 | 1976 | 73.86 | 1975 | 72.33 | 1974 | 71.18 | 1973 | 71.49 | 1972 | 72.09 | 1971 | 70.79 | 1970 | 70.69 | 1969 | 71.23 | 1968 | 71.64 | 1967 | 71.11 | 1966 | 70.32 | 1965 | 71.42 | 1964 | 70.81 | 1963 | 70.16 | 1962 | 71.4 | 1961 | 70.84 | 1960 | 72.104 |
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