Year | Value | 2021 | 77.35 | 2020 | 76.996 | 2019 | 79.856 | 2018 | 79.601 | 2017 | 79.381 | 2016 | 79.203 | 2015 | 78.833 | 2014 | 78.498 | 2013 | 77.913 | 2012 | 77.483 | 2011 | 77.713 | 2010 | 77.437 | 2009 | 77.149 | 2008 | 76.572 | 2007 | 76.322 | 2006 | 76.011 | 2005 | 75.781 | 2004 | 75.116 | 2003 | 75.375 | 2002 | 74.707 | 2001 | 74.587 | 2000 | 74.152 | 1999 | 73.767 | 1998 | 74.033 | 1997 | 73.293 | 1996 | 73.589 | 1995 | 73.023 | 1994 | 72.948 | 1993 | 72.69 | 1992 | 72.404 | 1991 | 72.122 | 1990 | 71.989 | 1989 | 71.877 | 1988 | 54.599 | 1987 | 70.913 | 1986 | 71.239 | 1985 | 70.874 | 1984 | 70.719 | 1983 | 70.564 | 1982 | 70.153 | 1981 | 69.838 | 1980 | 69.335 | 1979 | 69.403 | 1978 | 69.04 | 1977 | 68.718 | 1976 | 68.355 | 1975 | 68.157 | 1974 | 68.152 | 1973 | 68.004 | 1972 | 67.96 | 1971 | 67.559 | 1970 | 67.17 | 1969 | 67.011 | 1968 | 66.652 | 1967 | 66.296 | 1966 | 65.981 | 1965 | 65.908 | 1964 | 65.52 | 1963 | 65.278 | 1962 | 65.404 | 1961 | 65.074 | 1960 | 64.634 |
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