Year | Value | 2022 | 33.089 | 2021 | 33.144 | 2020 | 33.179 | 2019 | 33.195 | 2018 | 33.19 | 2017 | 33.164 | 2016 | 33.119 | 2015 | 33.054 | 2014 | 32.969 | 2013 | 32.863 | 2012 | 32.739 | 2011 | 32.594 | 2010 | 32.449 | 2009 | 32.305 | 2008 | 32.161 | 2007 | 32.018 | 2006 | 31.875 | 2005 | 31.732 | 2004 | 31.59 | 2003 | 31.447 | 2002 | 31.306 | 2001 | 31.231 | 2000 | 31.352 | 1999 | 31.473 | 1998 | 31.595 | 1997 | 31.717 | 1996 | 31.839 | 1995 | 31.962 | 1994 | 32.085 | 1993 | 32.208 | 1992 | 32.402 | 1991 | 32.812 | 1990 | 33.224 | 1989 | 33.639 | 1988 | 34.055 | 1987 | 34.476 | 1986 | 34.898 | 1985 | 35.322 | 1984 | 35.748 | 1983 | 36.178 | 1982 | 37.036 | 1981 | 39.191 | 1980 | 41.386 | 1979 | 43.622 | 1978 | 45.881 | 1977 | 48.157 | 1976 | 50.437 | 1975 | 52.723 | 1974 | 54.993 | 1973 | 57.243 | 1972 | 58.193 | 1971 | 58.717 | 1970 | 59.239 | 1969 | 59.758 | 1968 | 60.274 | 1967 | 60.79 | 1966 | 61.302 | 1965 | 61.812 | 1964 | 62.319 | 1963 | 62.824 | 1962 | 63.326 | 1961 | 63.825 | 1960 | 64.372 |
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