Year | Value | 2021 | 70.5 | 2020 | 71.869 | 2019 | 71.767 | 2018 | 71.793 | 2017 | 71.911 | 2016 | 72.02 | 2015 | 72.394 | 2014 | 72.982 | 2013 | 73.412 | 2012 | 73.433 | 2011 | 73.094 | 2010 | 72.622 | 2009 | 72.124 | 2008 | 71.612 | 2007 | 71.418 | 2006 | 71.199 | 2005 | 71.044 | 2004 | 70.86 | 2003 | 70.806 | 2002 | 70.888 | 2001 | 70.758 | 2000 | 70.944 | 1999 | 70.968 | 1998 | 70.99 | 1997 | 71.207 | 1996 | 71.488 | 1995 | 71.549 | 1994 | 71.739 | 1993 | 71.921 | 1992 | 72.189 | 1991 | 72.186 | 1990 | 72.304 | 1989 | 72.157 | 1988 | 71.541 | 1987 | 71.273 | 1986 | 70.732 | 1985 | 70.52 | 1984 | 70.272 | 1983 | 70.16 | 1982 | 70.244 | 1981 | 69.859 | 1980 | 69.435 | 1979 | 69.048 | 1978 | 68.755 | 1977 | 68.534 | 1976 | 68.425 | 1975 | 68.048 | 1974 | 67.838 | 1973 | 67.551 | 1972 | 67.102 | 1971 | 66.795 | 1970 | 66.702 | 1969 | 66.381 | 1968 | 66.265 | 1967 | 66.442 | 1966 | 66.355 | 1965 | 65.972 | 1964 | 65.622 | 1963 | 65.27 | 1962 | 64.491 | 1961 | 64.394 | 1960 | 64.042 |
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