Year | Value | 2021 | 41.643 | 2020 | 41.995 | 2019 | 42.376 | 2018 | 42.901 | 2017 | 43.378 | 2016 | 43.818 | 2015 | 44.342 | 2014 | 44.794 | 2013 | 45.271 | 2012 | 45.918 | 2011 | 46.234 | 2010 | 46.588 | 2009 | 46.813 | 2008 | 46.983 | 2007 | 47.281 | 2006 | 47.614 | 2005 | 47.996 | 2004 | 47.895 | 2003 | 47.61 | 2002 | 47.491 | 2001 | 47.331 | 2000 | 47.112 | 1999 | 46.959 | 1998 | 46.23 | 1997 | 45.929 | 1996 | 45.667 | 1995 | 45.686 | 1994 | 46.379 | 1993 | 46.423 | 1992 | 46.702 | 1991 | 46.973 | 1990 | 46.651 | 1989 | 47.238 | 1988 | 47.691 | 1987 | 47.835 | 1986 | 48.314 | 1985 | 48.506 | 1984 | 48.877 | 1983 | 49.148 | 1982 | 49.615 | 1981 | 50.133 | 1980 | 50.338 | 1979 | 50.495 | 1978 | 50.376 | 1977 | 50.422 | 1976 | 50.408 | 1975 | 50.454 | 1974 | 50.402 | 1973 | 50.423 | 1972 | 50.347 | 1971 | 50.386 | 1970 | 50.358 | 1969 | 50.439 | 1968 | 50.654 | 1967 | 50.634 | 1966 | 50.566 | 1965 | 50.491 | 1964 | 50.355 | 1963 | 50.372 | 1962 | 50.42 | 1961 | 50.449 | 1960 | 50.498 |
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