Year | Value | 2021 | 79.918 | 2020 | 79.875 | 2019 | 80.116 | 2018 | 80.013 | 2017 | 79.943 | 2016 | 79.872 | 2015 | 79.695 | 2014 | 79.424 | 2013 | 79.057 | 2012 | 78.682 | 2011 | 78.124 | 2010 | 77.657 | 2009 | 77.069 | 2008 | 76.543 | 2007 | 75.686 | 2006 | 75.13 | 2005 | 74.751 | 2004 | 73.538 | 2003 | 74.06 | 2002 | 73.291 | 2001 | 72.181 | 2000 | 70.876 | 1999 | 70.088 | 1998 | 69.572 | 1997 | 69.225 | 1996 | 68.702 | 1995 | 67.476 | 1994 | 66.511 | 1993 | 65.739 | 1992 | 65.007 | 1991 | 64.304 | 1990 | 63.578 | 1989 | 62.847 | 1988 | 62.132 | 1987 | 61.31 | 1986 | 60.517 | 1985 | 59.749 | 1984 | 58.916 | 1983 | 58.09 | 1982 | 57.296 | 1981 | 56.421 | 1980 | 55.621 | 1979 | 54.676 | 1978 | 51.105 | 1977 | 52.632 | 1976 | 51.592 | 1975 | 50.519 | 1974 | 49.359 | 1973 | 48.214 | 1972 | 47.112 | 1971 | 46.125 | 1970 | 45.068 | 1969 | 44.275 | 1968 | 43.554 | 1967 | 42.771 | 1966 | 42.055 | 1965 | 41.383 | 1964 | 40.722 | 1963 | 40.071 | 1962 | 39.458 | 1961 | 38.982 | 1960 | 38.529 |
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