Year | Value | 2022 | 46.396 | 2021 | 46.201 | 2020 | 46.025 | 2019 | 45.866 | 2018 | 45.724 | 2017 | 45.601 | 2016 | 45.495 | 2015 | 45.406 | 2014 | 45.335 | 2013 | 45.282 | 2012 | 45.246 | 2011 | 45.228 | 2010 | 45.228 | 2009 | 45.245 | 2008 | 45.262 | 2007 | 45.279 | 2006 | 45.296 | 2005 | 45.313 | 2004 | 45.33 | 2003 | 45.347 | 2002 | 45.364 | 2001 | 45.381 | 2000 | 45.398 | 1999 | 45.582 | 1998 | 45.793 | 1997 | 46.003 | 1996 | 46.214 | 1995 | 46.425 | 1994 | 46.637 | 1993 | 46.848 | 1992 | 47.059 | 1991 | 47.271 | 1990 | 47.465 | 1989 | 47.655 | 1988 | 47.846 | 1987 | 48.037 | 1986 | 48.228 | 1985 | 48.419 | 1984 | 48.61 | 1983 | 48.801 | 1982 | 48.992 | 1981 | 49.183 | 1980 | 49.374 | 1979 | 49.537 | 1978 | 49.695 | 1977 | 49.854 | 1976 | 50.012 | 1975 | 50.171 | 1974 | 50.329 | 1973 | 50.488 | 1972 | 50.646 | 1971 | 50.805 | 1970 | 50.963 | 1969 | 51.238 | 1968 | 51.549 | 1967 | 51.86 | 1966 | 52.17 | 1965 | 52.481 | 1964 | 52.79 | 1963 | 53.101 | 1962 | 53.41 | 1961 | 53.72 | 1960 | 54.028 |
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