Year | Value | 2022 | 30.859 | 2021 | 31.225 | 2020 | 31.586 | 2019 | 31.941 | 2018 | 32.291 | 2017 | 32.635 | 2016 | 32.973 | 2015 | 33.304 | 2014 | 33.629 | 2013 | 33.948 | 2012 | 34.259 | 2011 | 34.563 | 2010 | 34.86 | 2009 | 35.149 | 2008 | 35.44 | 2007 | 35.732 | 2006 | 36.024 | 2005 | 36.318 | 2004 | 36.613 | 2003 | 36.909 | 2002 | 37.206 | 2001 | 37.503 | 2000 | 37.802 | 1999 | 38.549 | 1998 | 39.368 | 1997 | 40.193 | 1996 | 41.022 | 1995 | 41.859 | 1994 | 42.699 | 1993 | 43.544 | 1992 | 44.391 | 1991 | 45.243 | 1990 | 46.097 | 1989 | 46.503 | 1988 | 46.841 | 1987 | 47.18 | 1986 | 47.518 | 1985 | 47.857 | 1984 | 48.195 | 1983 | 48.535 | 1982 | 48.874 | 1981 | 49.214 | 1980 | 49.553 | 1979 | 49.841 | 1978 | 50.121 | 1977 | 50.402 | 1976 | 50.681 | 1975 | 50.962 | 1974 | 51.241 | 1973 | 51.521 | 1972 | 51.801 | 1971 | 52.081 | 1970 | 52.36 | 1969 | 52.962 | 1968 | 53.615 | 1967 | 54.268 | 1966 | 54.92 | 1965 | 55.569 | 1964 | 56.216 | 1963 | 56.863 | 1962 | 57.506 | 1961 | 58.147 | 1960 | 58.751 |
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