Year | Value | 2021 | 42.049 | 2020 | 42.311 | 2019 | 42.656 | 2018 | 42.989 | 2017 | 43.251 | 2016 | 43.411 | 2015 | 43.641 | 2014 | 43.992 | 2013 | 44.229 | 2012 | 44.646 | 2011 | 44.701 | 2010 | 44.526 | 2009 | 44.573 | 2008 | 44.43 | 2007 | 44.366 | 2006 | 44.393 | 2005 | 44.196 | 2004 | 44.256 | 2003 | 44.534 | 2002 | 44.697 | 2001 | 44.816 | 2000 | 45.004 | 1999 | 45.033 | 1998 | 45.105 | 1997 | 45.843 | 1996 | 46.791 | 1995 | 47.093 | 1994 | 45.905 | 1993 | 45.704 | 1992 | 45.913 | 1991 | 46.104 | 1990 | 46.005 | 1989 | 46.285 | 1988 | 46.504 | 1987 | 46.788 | 1986 | 46.684 | 1985 | 46.517 | 1984 | 46.156 | 1983 | 45.949 | 1982 | 45.801 | 1981 | 45.898 | 1980 | 45.961 | 1979 | 45.865 | 1978 | 45.562 | 1977 | 45.768 | 1976 | 46.091 | 1975 | 46.398 | 1974 | 46.653 | 1973 | 46.966 | 1972 | 47.286 | 1971 | 47.534 | 1970 | 47.635 | 1969 | 47.795 | 1968 | 47.919 | 1967 | 47.968 | 1966 | 47.926 | 1965 | 47.867 | 1964 | 47.713 | 1963 | 47.547 | 1962 | 47.369 | 1961 | 47.124 | 1960 | 46.909 |
|