Year | Value | 2021 | 63.928 | 2020 | 65.043 | 2019 | 65.409 | 2018 | 64.916 | 2017 | 64.608 | 2016 | 64.121 | 2015 | 63.509 | 2014 | 62.796 | 2013 | 61.782 | 2012 | 60.805 | 2011 | 59.592 | 2010 | 58.533 | 2009 | 56.618 | 2008 | 55.376 | 2007 | 53.869 | 2006 | 52.802 | 2005 | 51.594 | 2004 | 50.457 | 2003 | 49.439 | 2002 | 48.05 | 2001 | 47.251 | 2000 | 46.448 | 1999 | 45.777 | 1998 | 45.922 | 1997 | 46.245 | 1996 | 46.592 | 1995 | 46.875 | 1994 | 47.069 | 1993 | 47.582 | 1992 | 47.824 | 1991 | 48.418 | 1990 | 49.293 | 1989 | 50.2 | 1988 | 51.029 | 1987 | 51.952 | 1986 | 52.68 | 1985 | 53.568 | 1984 | 54.502 | 1983 | 55.122 | 1982 | 55.721 | 1981 | 55.786 | 1980 | 55.834 | 1979 | 56.05 | 1978 | 56.221 | 1977 | 56.31 | 1976 | 56.059 | 1975 | 55.566 | 1974 | 55.109 | 1973 | 54.512 | 1972 | 53.858 | 1971 | 53.251 | 1970 | 52.68 | 1969 | 52.354 | 1968 | 52.038 | 1967 | 51.999 | 1966 | 51.869 | 1965 | 51.775 | 1964 | 51.18 | 1963 | 51.301 | 1962 | 50.953 | 1961 | 50.639 | 1960 | 50.242 |
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