Year | Value | 2021 | 71.654 | 2020 | 74.688 | 2019 | 73.579 | 2018 | 73.753 | 2017 | 73.732 | 2016 | 73.586 | 2015 | 73.392 | 2014 | 73.196 | 2013 | 73.029 | 2012 | 72.888 | 2011 | 72.764 | 2010 | 72.649 | 2009 | 72.534 | 2008 | 72.412 | 2007 | 72.271 | 2006 | 72.109 | 2005 | 71.91 | 2004 | 71.683 | 2003 | 71.419 | 2002 | 71.135 | 2001 | 70.85 | 2000 | 70.575 | 1999 | 70.329 | 1998 | 70.118 | 1997 | 69.938 | 1996 | 69.787 | 1995 | 69.661 | 1994 | 69.561 | 1993 | 69.479 | 1992 | 69.405 | 1991 | 69.33 | 1990 | 69.242 | 1989 | 69.131 | 1988 | 68.991 | 1987 | 68.822 | 1986 | 68.623 | 1985 | 68.397 | 1984 | 68.147 | 1983 | 67.874 | 1982 | 67.585 | 1981 | 67.285 | 1980 | 66.986 | 1979 | 66.702 | 1978 | 66.442 | 1977 | 66.212 | 1976 | 66.015 | 1975 | 65.86 | 1974 | 65.757 | 1973 | 65.704 | 1972 | 65.52 | 1971 | 65.672 | 1970 | 65.65 | 1969 | 65.601 | 1968 | 65.52 | 1967 | 65.41 | 1966 | 65.307 | 1965 | 65.2 | 1964 | 65.109 | 1963 | 65.035 | 1962 | 64.965 | 1961 | 64.884 | 1960 | 64.78 |
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