Year | Value | 2022 | 53.271 | 2021 | 53.076 | 2020 | 52.898 | 2019 | 52.735 | 2018 | 52.588 | 2017 | 52.458 | 2016 | 52.343 | 2015 | 52.245 | 2014 | 52.162 | 2013 | 52.096 | 2012 | 52.046 | 2011 | 52.012 | 2010 | 51.994 | 2009 | 51.976 | 2008 | 51.958 | 2007 | 51.94 | 2006 | 51.922 | 2005 | 51.905 | 2004 | 51.887 | 2003 | 51.869 | 2002 | 51.851 | 2001 | 51.833 | 2000 | 51.823 | 1999 | 51.815 | 1998 | 51.808 | 1997 | 51.8 | 1996 | 51.792 | 1995 | 51.783 | 1994 | 51.773 | 1993 | 51.764 | 1992 | 51.754 | 1991 | 51.745 | 1990 | 51.746 | 1989 | 51.75 | 1988 | 51.754 | 1987 | 51.757 | 1986 | 51.761 | 1985 | 51.765 | 1984 | 51.769 | 1983 | 51.773 | 1982 | 51.776 | 1981 | 51.78 | 1980 | 51.784 | 1979 | 51.788 | 1978 | 51.791 | 1977 | 51.795 | 1976 | 51.799 | 1975 | 52.403 | 1974 | 53.194 | 1973 | 53.983 | 1972 | 54.77 | 1971 | 55.556 | 1970 | 55.831 | 1969 | 55.991 | 1968 | 56.151 | 1967 | 56.311 | 1966 | 56.47 | 1965 | 56.305 | 1964 | 56.066 | 1963 | 55.826 | 1962 | 55.586 | 1961 | 55.345 | 1960 | 55.123 |
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