Year | Value | 2022 | 49.534 | 2021 | 49.573 | 2020 | 49.584 | 2019 | 49.567 | 2018 | 49.522 | 2017 | 49.45 | 2016 | 49.35 | 2015 | 49.25 | 2014 | 49.15 | 2013 | 49.05 | 2012 | 48.95 | 2011 | 48.85 | 2010 | 49.044 | 2009 | 49.528 | 2008 | 50.011 | 2007 | 50.495 | 2006 | 50.979 | 2005 | 51.463 | 2004 | 51.946 | 2003 | 52.429 | 2002 | 52.912 | 2001 | 53.394 | 2000 | 53.874 | 1999 | 54.356 | 1998 | 54.836 | 1997 | 55.315 | 1996 | 55.792 | 1995 | 56.269 | 1994 | 56.745 | 1993 | 57.22 | 1992 | 57.692 | 1991 | 58.164 | 1990 | 58.635 | 1989 | 59.103 | 1988 | 59.315 | 1987 | 59.303 | 1986 | 59.29 | 1985 | 59.278 | 1984 | 59.266 | 1983 | 59.254 | 1982 | 59.242 | 1981 | 59.23 | 1980 | 59.218 | 1979 | 59.206 | 1978 | 59.464 | 1977 | 59.949 | 1976 | 60.432 | 1975 | 60.913 | 1974 | 61.392 | 1973 | 61.869 | 1972 | 62.343 | 1971 | 62.816 | 1970 | 63.286 | 1969 | 63.646 | 1968 | 63.913 | 1967 | 64.18 | 1966 | 64.446 | 1965 | 64.711 | 1964 | 64.975 | 1963 | 65.238 | 1962 | 65.5 | 1961 | 65.762 | 1960 | 66.022 |
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