Year | Value | 2021 | 74.03 | 2020 | 75.53 | 2019 | 77.3 | 2018 | 77.19 | 2017 | 76.92 | 2016 | 76.61 | 2015 | 76.26 | 2014 | 75.82 | 2013 | 75.23 | 2012 | 74.29 | 2011 | 73.57 | 2010 | 73.41 | 2009 | 73.25 | 2008 | 72.4 | 2007 | 72.3 | 2006 | 72 | 2005 | 71.8 | 2004 | 72 | 2003 | 71.5 | 2002 | 71.6 | 2001 | 71.3 | 2000 | 71.2 | 1999 | 70.9 | 1998 | 70.4 | 1997 | 69.9 | 1996 | 69.7 | 1995 | 69.4 | 1994 | 70.3 | 1993 | 70.8 | 1992 | 72.3 | 1991 | 72.4 | 1990 | 73.1 | 1989 | 72.9 | 1988 | 73.1 | 1987 | 73.9 | 1986 | 73.6 | 1985 | 73.3 | 1984 | 73.3 | 1983 | 72.4 | 1982 | 71.5 | 1981 | 71.7 | 1980 | 71.9 | 1979 | 67.543 | 1978 | 67.29 | 1977 | 67.103 | 1976 | 66.792 | 1975 | 67.183 | 1974 | 66.965 | 1973 | 66.595 | 1972 | 66.268 | 1971 | 65.916 | 1970 | 65.695 | 1969 | 65.371 | 1968 | 65.128 | 1967 | 65.043 | 1966 | 64.898 | 1965 | 64.494 | 1964 | 64.177 | 1963 | 63.942 | 1962 | 63.504 | 1961 | 63.477 | 1960 | 63.494 |
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