Year | Value | 2021 | 62.124 | 2020 | 62.212 | 2019 | 61.346 | 2018 | 62.834 | 2017 | 62.392 | 2016 | 62.185 | 2015 | 62.137 | 2014 | 61.656 | 2013 | 61.388 | 2012 | 61.288 | 2011 | 60.833 | 2010 | 60.57 | 2009 | 60.135 | 2008 | 59.6 | 2007 | 58.848 | 2006 | 58.194 | 2005 | 57.452 | 2004 | 56.34 | 2003 | 55.284 | 2002 | 54.388 | 2001 | 53.752 | 2000 | 52.932 | 1999 | 51.712 | 1998 | 49.012 | 1997 | 42.922 | 1996 | 52.795 | 1995 | 53.012 | 1994 | 53.059 | 1993 | 53.358 | 1992 | 53.775 | 1991 | 53.767 | 1990 | 54.147 | 1989 | 54.36 | 1988 | 54.52 | 1987 | 54.686 | 1986 | 54.63 | 1985 | 54.644 | 1984 | 54.58 | 1983 | 54.284 | 1982 | 54.012 | 1981 | 53.953 | 1980 | 53.66 | 1979 | 53.49 | 1978 | 53.186 | 1977 | 53.054 | 1976 | 52.798 | 1975 | 52.605 | 1974 | 52.275 | 1973 | 51.919 | 1972 | 51.643 | 1971 | 51.322 | 1970 | 50.956 | 1969 | 50.495 | 1968 | 50.047 | 1967 | 49.565 | 1966 | 49.174 | 1965 | 48.621 | 1964 | 48.16 | 1963 | 47.596 | 1962 | 46.993 | 1961 | 46.225 | 1960 | 45.544 |
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