Year | Value | 2022 | 53.34 | 2021 | 53.265 | 2020 | 53.214 | 2019 | 53.187 | 2018 | 53.184 | 2017 | 53.205 | 2016 | 53.25 | 2015 | 53.319 | 2014 | 53.413 | 2013 | 53.53 | 2012 | 53.671 | 2011 | 53.836 | 2010 | 54.025 | 2009 | 54.213 | 2008 | 54.402 | 2007 | 54.59 | 2006 | 54.779 | 2005 | 54.967 | 2004 | 55.155 | 2003 | 55.343 | 2002 | 55.53 | 2001 | 55.718 | 2000 | 55.905 | 1999 | 55.771 | 1998 | 55.589 | 1997 | 55.406 | 1996 | 55.224 | 1995 | 55.04 | 1994 | 54.857 | 1993 | 54.674 | 1992 | 54.491 | 1991 | 54.308 | 1990 | 54.124 | 1989 | 53.941 | 1988 | 53.757 | 1987 | 53.573 | 1986 | 53.389 | 1985 | 53.205 | 1984 | 53.021 | 1983 | 52.837 | 1982 | 52.653 | 1981 | 52.468 | 1980 | 52.284 | 1979 | 51.449 | 1978 | 50.51 | 1977 | 49.57 | 1976 | 48.631 | 1975 | 47.691 | 1974 | 46.754 | 1973 | 45.819 | 1972 | 44.888 | 1971 | 43.959 | 1970 | 43.035 | 1969 | 42.115 | 1968 | 41.203 | 1967 | 40.294 | 1966 | 39.392 | 1965 | 38.498 | 1964 | 37.613 | 1963 | 36.734 | 1962 | 35.864 | 1961 | 35.004 | 1960 | 34.155 |
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