Year | Value | 2021 | 76.806 | 2020 | 76.567 | 2019 | 79.022 | 2018 | 78.696 | 2017 | 78.783 | 2016 | 78.981 | 2015 | 78.922 | 2014 | 78.88 | 2013 | 78.587 | 2012 | 78.28 | 2011 | 77.74 | 2010 | 77.63 | 2009 | 77.665 | 2008 | 77.392 | 2007 | 76.516 | 2006 | 75.636 | 2005 | 75.616 | 2004 | 75.304 | 2003 | 74.968 | 2002 | 74.676 | 2001 | 74.394 | 2000 | 74.072 | 1999 | 69.418 | 1998 | 71.306 | 1997 | 73.066 | 1996 | 72.76 | 1995 | 72.441 | 1994 | 72.125 | 1993 | 71.817 | 1992 | 71.487 | 1991 | 71.246 | 1990 | 70.917 | 1989 | 70.602 | 1988 | 70.28 | 1987 | 69.929 | 1986 | 69.587 | 1985 | 69.274 | 1984 | 68.997 | 1983 | 68.641 | 1982 | 68.302 | 1981 | 67.989 | 1980 | 67.685 | 1979 | 67.389 | 1978 | 67.05 | 1977 | 66.74 | 1976 | 66.441 | 1975 | 66.134 | 1974 | 65.83 | 1973 | 65.522 | 1972 | 65.193 | 1971 | 64.874 | 1970 | 64.584 | 1969 | 64.273 | 1968 | 63.935 | 1967 | 63.653 | 1966 | 63.323 | 1965 | 63.041 | 1964 | 62.734 | 1963 | 62.44 | 1962 | 62.134 | 1961 | 61.836 | 1960 | 61.485 |
|