Year | Value | 2021 | 24.944 | 2020 | 25.258 | 2019 | 25.511 | 2018 | 25.921 | 2017 | 26.487 | 2016 | 27.018 | 2015 | 27.7 | 2014 | 28.429 | 2013 | 29.144 | 2012 | 29.822 | 2011 | 30.667 | 2010 | 31.39 | 2009 | 32.315 | 2008 | 33.173 | 2007 | 34.191 | 2006 | 35.355 | 2005 | 36.475 | 2004 | 37.598 | 2003 | 38.298 | 2002 | 38.954 | 2001 | 39.117 | 2000 | 39.095 | 1999 | 39.408 | 1998 | 39.611 | 1997 | 39.892 | 1996 | 40.247 | 1995 | 40.638 | 1994 | 40.913 | 1993 | 41.196 | 1992 | 41.571 | 1991 | 41.756 | 1990 | 42.195 | 1989 | 42.334 | 1988 | 42.45 | 1987 | 42.478 | 1986 | 42.53 | 1985 | 42.417 | 1984 | 42.155 | 1983 | 41.892 | 1982 | 41.623 | 1981 | 41.321 | 1980 | 38.969 | 1979 | 38.327 | 1978 | 37.893 | 1977 | 37.85 | 1976 | 38.268 | 1975 | 39.086 | 1974 | 39.759 | 1973 | 40.679 | 1972 | 41.583 | 1971 | 42.384 | 1970 | 43.055 | 1969 | 43.6 | 1968 | 44.066 | 1967 | 44.487 | 1966 | 44.864 | 1965 | 45.191 | 1964 | 45.453 | 1963 | 45.635 | 1962 | 45.73 | 1961 | 45.737 | 1960 | 45.659 |
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