Year | Value | 2021 | 80.525 | 2020 | 80.588 | 2019 | 80.737 | 2018 | 80.596 | 2017 | 80.457 | 2016 | 80.314 | 2015 | 78.905 | 2014 | 80.037 | 2013 | 79.473 | 2012 | 79.337 | 2011 | 79.19 | 2010 | 78.983 | 2009 | 78.681 | 2008 | 78.449 | 2007 | 78.331 | 2006 | 78.191 | 2005 | 77.623 | 2004 | 76.966 | 2003 | 76.096 | 2002 | 75.42 | 2001 | 75.51 | 2000 | 74.725 | 1999 | 73.666 | 1998 | 74.603 | 1997 | 73.691 | 1996 | 73.756 | 1995 | 73.264 | 1994 | 73.339 | 1993 | 72.31 | 1992 | 73.078 | 1991 | 72.151 | 1990 | 71.959 | 1989 | 70.924 | 1988 | 71.239 | 1987 | 70.678 | 1986 | 70.292 | 1985 | 69.48 | 1984 | 69.88 | 1983 | 69.716 | 1982 | 69.1 | 1981 | 69.079 | 1980 | 68.304 | 1979 | 67.882 | 1978 | 67.511 | 1977 | 67.281 | 1976 | 67.162 | 1975 | 66.918 | 1974 | 65.989 | 1973 | 66.555 | 1972 | 65.371 | 1971 | 65.956 | 1970 | 65.684 | 1969 | 65.193 | 1968 | 65.625 | 1967 | 65.968 | 1966 | 65.273 | 1965 | 64.978 | 1964 | 64.838 | 1963 | 63.522 | 1962 | 64.293 | 1961 | 63.629 | 1960 | 64.409 |
|