Year | Value | 2021 | 61.63 | 2020 | 61.9 | 2019 | 62.686 | 2018 | 62.215 | 2017 | 62.123 | 2016 | 61.933 | 2015 | 61.379 | 2014 | 61.188 | 2013 | 60.778 | 2012 | 60.219 | 2011 | 60.08 | 2010 | 59.827 | 2009 | 59.44 | 2008 | 59.209 | 2007 | 58.795 | 2006 | 58.759 | 2005 | 58.434 | 2004 | 57.904 | 2003 | 57.794 | 2002 | 57.369 | 2001 | 57.019 | 2000 | 57.101 | 1999 | 56.84 | 1998 | 56.422 | 1997 | 55.969 | 1996 | 55.724 | 1995 | 55.552 | 1994 | 55.082 | 1993 | 55.486 | 1992 | 54.945 | 1991 | 54.673 | 1990 | 54.163 | 1989 | 53.549 | 1988 | 52.769 | 1987 | 52.081 | 1986 | 51.255 | 1985 | 50.534 | 1984 | 50.267 | 1983 | 49.853 | 1982 | 49.64 | 1981 | 49.359 | 1980 | 49.335 | 1979 | 49.005 | 1978 | 48.739 | 1977 | 48.286 | 1976 | 47.839 | 1975 | 47.317 | 1974 | 46.831 | 1973 | 46.453 | 1972 | 46.073 | 1971 | 45.781 | 1970 | 45.783 | 1969 | 45.666 | 1968 | 45.669 | 1967 | 45.638 | 1966 | 45.736 | 1965 | 45.752 | 1964 | 45.641 | 1963 | 45.683 | 1962 | 45.505 | 1961 | 45.427 | 1960 | 45.111 |
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