Year | Value | 2021 | 80.941 | 2020 | 81.316 | 2019 | 81.171 | 2018 | 81 | 2017 | 80.721 | 2016 | 80.645 | 2015 | 80.389 | 2014 | 80.535 | 2013 | 80.23 | 2012 | 79.961 | 2011 | 79.706 | 2010 | 79.434 | 2009 | 79.305 | 2008 | 79.088 | 2007 | 78.769 | 2006 | 78.349 | 2005 | 78.369 | 2004 | 77.964 | 2003 | 78.01 | 2002 | 78.433 | 2001 | 78.136 | 2000 | 77.62 | 1999 | 77.237 | 1998 | 76.964 | 1997 | 76.768 | 1996 | 76.542 | 1995 | 76.222 | 1994 | 76.063 | 1993 | 75.835 | 1992 | 75.941 | 1991 | 75.895 | 1990 | 75.97 | 1989 | 75.895 | 1988 | 76.055 | 1987 | 76.111 | 1986 | 76.072 | 1985 | 76.066 | 1984 | 76.002 | 1983 | 75.953 | 1982 | 75.984 | 1981 | 75.815 | 1980 | 75.669 | 1979 | 75.569 | 1978 | 75.389 | 1977 | 74.964 | 1976 | 74.747 | 1975 | 74.5 | 1974 | 74.26 | 1973 | 73.758 | 1972 | 73.511 | 1971 | 73.215 | 1970 | 72.508 | 1969 | 71.965 | 1968 | 71.067 | 1967 | 70.274 | 1966 | 69.357 | 1965 | 68.445 | 1964 | 67.489 | 1963 | 66.396 | 1962 | 65.506 | 1961 | 64.617 | 1960 | 63.767 |
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