Year | Value | 2022 | 53.065 | 2021 | 52.573 | 2020 | 52.089 | 2019 | 51.615 | 2018 | 51.151 | 2017 | 50.697 | 2016 | 50.254 | 2015 | 49.82 | 2014 | 49.397 | 2013 | 48.985 | 2012 | 48.583 | 2011 | 48.193 | 2010 | 47.813 | 2009 | 47.445 | 2008 | 47.088 | 2007 | 46.742 | 2006 | 46.396 | 2005 | 46.051 | 2004 | 45.706 | 2003 | 45.361 | 2002 | 45.017 | 2001 | 44.673 | 2000 | 44.331 | 1999 | 43.988 | 1998 | 43.646 | 1997 | 43.304 | 1996 | 42.964 | 1995 | 45.96 | 1994 | 48.981 | 1993 | 52.009 | 1992 | 55.019 | 1991 | 58 | 1990 | 55.422 | 1989 | 52.814 | 1988 | 50.195 | 1987 | 47.567 | 1986 | 44.956 | 1985 | 42.373 | 1984 | 39.834 | 1983 | 38.194 | 1982 | 37.173 | 1981 | 36.163 | 1980 | 35.167 | 1979 | 34.181 | 1978 | 33.209 | 1977 | 32.252 | 1976 | 31.311 | 1975 | 30.382 | 1974 | 29.47 | 1973 | 28.581 | 1972 | 27.713 | 1971 | 26.86 | 1970 | 26.025 | 1969 | 25.207 | 1968 | 24.407 | 1967 | 23.622 | 1966 | 22.856 | 1965 | 22.108 | 1964 | 21.378 | 1963 | 20.664 | 1962 | 19.969 | 1961 | 19.291 | 1960 | 18.632 |
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