Year | Value | 2021 | 80.621 | 2020 | 79.49 | 2019 | 80.18 | 2018 | 79.8 | 2017 | 79.75 | 2016 | 79.92 | 2015 | 79.84 | 2014 | 79.76 | 2013 | 79.74 | 2012 | 79.61 | 2011 | 79.39 | 2010 | 79.21 | 2009 | 78.91 | 2008 | 78.51 | 2007 | 78.29 | 2006 | 78.29 | 2005 | 77.82 | 2004 | 77.68 | 2003 | 77.32 | 2002 | 77.16 | 2001 | 76.92 | 2000 | 76.64 | 1999 | 76.2 | 1998 | 75.97 | 1997 | 75.71 | 1996 | 75.43 | 1995 | 75.07 | 1994 | 74.94 | 1993 | 74.7 | 1992 | 74.76 | 1991 | 74.53 | 1990 | 74.3 | 1989 | 73.92 | 1988 | 73.61 | 1987 | 73.53 | 1986 | 73.22 | 1985 | 73.02 | 1984 | 73.01 | 1983 | 72.68 | 1982 | 72.33 | 1981 | 72.01 | 1980 | 71.59 | 1979 | 71.32 | 1978 | 70.92 | 1977 | 70.64 | 1976 | 70.3 | 1975 | 69.99 | 1974 | 69.74 | 1973 | 69.67 | 1972 | 69.49 | 1971 | 69.6 | 1970 | 69.32 | 1969 | 69.16 | 1968 | 69.09 | 1967 | 68.92 | 1966 | 68.78 | 1965 | 68.76 | 1964 | 68.63 | 1963 | 68.41 | 1962 | 68.45 | 1961 | 68.39 | 1960 | 68.26 |
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