Year | Value | 2021 | 76.1 | 2020 | 76 | 2019 | 75.8 | 2018 | 75.6 | 2017 | 75.4 | 2016 | 75.1 | 2015 | 74.8 | 2014 | 74.5 | 2013 | 74.3 | 2012 | 74.1 | 2011 | 73.7 | 2010 | 73.5 | 2009 | 73.2 | 2008 | 72.6 | 2007 | 72.3 | 2006 | 72.1 | 2005 | 71.9 | 2004 | 72.2 | 2003 | 72.2 | 2002 | 72.1 | 2001 | 72.6 | 2000 | 72.4 | 1999 | 72.6 | 1998 | 71.2 | 1997 | 71.4 | 1996 | 71 | 1995 | 70.4 | 1994 | 70.7 | 1993 | 71.7 | 1992 | 72.2 | 1991 | 72.7 | 1990 | 72.6 | 1989 | 71.8 | 1988 | 67.366 | 1987 | 67.044 | 1986 | 66.778 | 1985 | 66.673 | 1984 | 66.025 | 1983 | 65.765 | 1982 | 65.037 | 1981 | 64.911 | 1980 | 64.737 | 1979 | 64.301 | 1978 | 63.941 | 1977 | 63.578 | 1976 | 63.169 | 1975 | 63.126 | 1974 | 63.252 | 1973 | 62.889 | 1972 | 62.489 | 1971 | 62.108 | 1970 | 61.94 | 1969 | 61.534 | 1968 | 61.181 | 1967 | 60.864 | 1966 | 60.794 | 1965 | 60.295 | 1964 | 60.072 | 1963 | 59.969 | 1962 | 59.6 | 1961 | 59.229 | 1960 | 59.051 |
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