Year | Value | 2021 | 76.656 | 2020 | 76.612 | 2019 | 77.717 | 2018 | 77.439 | 2017 | 77.155 | 2016 | 76.877 | 2015 | 76.616 | 2014 | 76.749 | 2013 | 76.72 | 2012 | 76.707 | 2011 | 76.872 | 2010 | 76.879 | 2009 | 77.094 | 2008 | 77.185 | 2007 | 77.098 | 2006 | 77.136 | 2005 | 77.182 | 2004 | 76.923 | 2003 | 76.504 | 2002 | 75.793 | 2001 | 75.41 | 2000 | 74.417 | 1999 | 74.066 | 1998 | 73.632 | 1997 | 73.349 | 1996 | 73.092 | 1995 | 73.29 | 1994 | 73.058 | 1993 | 72.952 | 1992 | 72.718 | 1991 | 72.497 | 1990 | 72.473 | 1989 | 72.164 | 1988 | 71.885 | 1987 | 71.564 | 1986 | 71.325 | 1985 | 71.069 | 1984 | 70.819 | 1983 | 70.59 | 1982 | 70.32 | 1981 | 70.077 | 1980 | 69.861 | 1979 | 69.579 | 1978 | 68.686 | 1977 | 67.922 | 1976 | 67.032 | 1975 | 66.577 | 1974 | 66.01 | 1973 | 65.752 | 1972 | 65.351 | 1971 | 65.193 | 1970 | 64.825 | 1969 | 64.545 | 1968 | 64.152 | 1967 | 63.566 | 1966 | 62.778 | 1965 | 62.893 | 1964 | 62.878 | 1963 | 62.359 | 1962 | 61.708 | 1961 | 61.395 | 1960 | 60.897 |
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