Year | Value | 2022 | 31.07 | 2021 | 31.215 | 2020 | 31.343 | 2019 | 31.457 | 2018 | 31.555 | 2017 | 31.637 | 2016 | 31.703 | 2015 | 31.77 | 2014 | 31.837 | 2013 | 31.903 | 2012 | 31.97 | 2011 | 32.037 | 2010 | 32.433 | 2009 | 33.42 | 2008 | 34.419 | 2007 | 35.436 | 2006 | 36.465 | 2005 | 37.506 | 2004 | 38.557 | 2003 | 39.622 | 2002 | 40.696 | 2001 | 41.778 | 2000 | 42.867 | 1999 | 43.377 | 1998 | 43.331 | 1997 | 43.286 | 1996 | 43.24 | 1995 | 43.195 | 1994 | 43.149 | 1993 | 43.104 | 1992 | 43.058 | 1991 | 43.013 | 1990 | 42.967 | 1989 | 42.922 | 1988 | 43.2 | 1987 | 43.785 | 1986 | 44.372 | 1985 | 44.96 | 1984 | 45.548 | 1983 | 46.14 | 1982 | 46.732 | 1981 | 47.324 | 1980 | 47.917 | 1979 | 48.512 | 1978 | 49.173 | 1977 | 49.897 | 1976 | 50.619 | 1975 | 51.344 | 1974 | 52.067 | 1973 | 52.789 | 1972 | 53.509 | 1971 | 54.23 | 1970 | 54.948 | 1969 | 55.664 | 1968 | 56.283 | 1967 | 56.819 | 1966 | 57.353 | 1965 | 57.886 | 1964 | 58.415 | 1963 | 58.944 | 1962 | 60.27 | 1961 | 62.318 | 1960 | 64.321 |
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