Year | Value | 2021 | 69.96 | 2020 | 71.6 | 2019 | 73.4 | 2018 | 73.5 | 2017 | 73.1 | 2016 | 73.2 | 2015 | 72.8 | 2014 | 72.8 | 2013 | 72.6 | 2012 | 72.3 | 2011 | 72 | 2010 | 71.8 | 2009 | 71.4 | 2008 | 71.3 | 2007 | 70.9 | 2006 | 70.8 | 2005 | 70.2 | 2004 | 70 | 2003 | 69.9 | 2002 | 69.7 | 2001 | 69.6 | 2000 | 68.9 | 1999 | 66.613 | 1998 | 68.139 | 1997 | 68.599 | 1996 | 68.475 | 1995 | 68.669 | 1994 | 68.197 | 1993 | 67.888 | 1992 | 67.658 | 1991 | 67.506 | 1990 | 67.138 | 1989 | 66.742 | 1988 | 66.504 | 1987 | 66.073 | 1986 | 65.884 | 1985 | 65.733 | 1984 | 65.392 | 1983 | 65.321 | 1982 | 65.68 | 1981 | 65.774 | 1980 | 65.916 | 1979 | 65.795 | 1978 | 65.944 | 1977 | 66.096 | 1976 | 65.927 | 1975 | 65.612 | 1974 | 65.453 | 1973 | 65.103 | 1972 | 64.512 | 1971 | 64.087 | 1970 | 63.694 | 1969 | 63.285 | 1968 | 63.364 | 1967 | 63.318 | 1966 | 63.812 | 1965 | 63.261 | 1964 | 63.022 | 1963 | 63.287 | 1962 | 62.852 | 1961 | 62.634 | 1960 | 62.594 |
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