Year | Value | 2021 | 68.886 | 2020 | 71.824 | 2019 | 72.395 | 2018 | 72.142 | 2017 | 71.856 | 2016 | 71.503 | 2015 | 71.077 | 2014 | 70.602 | 2013 | 70.083 | 2012 | 69.592 | 2011 | 69.106 | 2010 | 68.645 | 2009 | 68.215 | 2008 | 67.786 | 2007 | 67.342 | 2006 | 66.891 | 2005 | 66.379 | 2004 | 65.831 | 2003 | 65.287 | 2002 | 64.729 | 2001 | 64.131 | 2000 | 63.639 | 1999 | 63.111 | 1998 | 62.595 | 1997 | 62.148 | 1996 | 61.733 | 1995 | 61.351 | 1994 | 61.007 | 1993 | 60.65 | 1992 | 60.335 | 1991 | 59.956 | 1990 | 59.537 | 1989 | 59.064 | 1988 | 58.546 | 1987 | 57.999 | 1986 | 57.459 | 1985 | 56.898 | 1984 | 56.315 | 1983 | 55.712 | 1982 | 55.068 | 1981 | 54.397 | 1980 | 53.696 | 1979 | 52.985 | 1978 | 52.258 | 1977 | 51.512 | 1976 | 50.852 | 1975 | 50.158 | 1974 | 49.526 | 1973 | 48.806 | 1972 | 48.31 | 1971 | 47.938 | 1970 | 47.587 | 1969 | 47.22 | 1968 | 46.837 | 1967 | 45.083 | 1966 | 44.727 | 1965 | 44.361 | 1964 | 45.501 | 1963 | 45.248 | 1962 | 44.961 | 1961 | 44.695 | 1960 | 44.508 |
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