Year | Value | 2021 | 32.859 | 2020 | 33.233 | 2019 | 33.598 | 2018 | 33.925 | 2017 | 34.343 | 2016 | 34.824 | 2015 | 35.767 | 2014 | 36.791 | 2013 | 37.85 | 2012 | 38.794 | 2011 | 39.89 | 2010 | 40.825 | 2009 | 41.811 | 2008 | 42.685 | 2007 | 43.609 | 2006 | 44.373 | 2005 | 44.893 | 2004 | 44.961 | 2003 | 45.066 | 2002 | 45.084 | 2001 | 45.192 | 2000 | 45.366 | 1999 | 45.987 | 1998 | 46.188 | 1997 | 46.062 | 1996 | 46.003 | 1995 | 46.324 | 1994 | 46.622 | 1993 | 46.908 | 1992 | 47.232 | 1991 | 47.483 | 1990 | 47.778 | 1989 | 48.266 | 1988 | 48.879 | 1987 | 49.489 | 1986 | 49.911 | 1985 | 50.348 | 1984 | 50.664 | 1983 | 51.312 | 1982 | 51.911 | 1981 | 52.277 | 1980 | 52.641 | 1979 | 52.51 | 1978 | 52.62 | 1977 | 52.747 | 1976 | 52.793 | 1975 | 52.867 | 1974 | 52.984 | 1973 | 53.219 | 1972 | 53.467 | 1971 | 53.619 | 1970 | 53.851 | 1969 | 54.082 | 1968 | 54.342 | 1967 | 54.298 | 1966 | 54.161 | 1965 | 54.05 | 1964 | 54.064 | 1963 | 54.307 | 1962 | 54.016 | 1961 | 53.703 | 1960 | 53.288 |
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