Year | Value | 2022 | 47.324 | 2021 | 46.731 | 2020 | 46.141 | 2019 | 45.554 | 2018 | 44.971 | 2017 | 44.391 | 2016 | 43.816 | 2015 | 43.245 | 2014 | 42.679 | 2013 | 42.117 | 2012 | 41.558 | 2011 | 41 | 2010 | 39.31 | 2009 | 37.645 | 2008 | 36.011 | 2007 | 34.404 | 2006 | 37.1 | 2005 | 36.311 | 2004 | 35.531 | 2003 | 34.756 | 2002 | 33.99 | 2001 | 33.617 | 2000 | 33.247 | 1999 | 32.878 | 1998 | 32.511 | 1997 | 32.147 | 1996 | 31.785 | 1995 | 31.425 | 1994 | 31.067 | 1993 | 30.711 | 1992 | 30.359 | 1991 | 30.007 | 1990 | 29.658 | 1989 | 29.312 | 1988 | 28.969 | 1987 | 28.627 | 1986 | 28.333 | 1985 | 28.067 | 1984 | 27.804 | 1983 | 27.541 | 1982 | 27.28 | 1981 | 27.021 | 1980 | 26.763 | 1979 | 26.507 | 1978 | 26.252 | 1977 | 25.999 | 1976 | 25.748 | 1975 | 25.498 | 1974 | 25.03 | 1973 | 24.427 | 1972 | 23.835 | 1971 | 23.251 | 1970 | 22.678 | 1969 | 22.115 | 1968 | 21.563 | 1967 | 21.02 | 1966 | 20.487 | 1965 | 19.964 | 1964 | 19.453 | 1963 | 18.92 | 1962 | 18.372 | 1961 | 17.835 | 1960 | 17.312 |
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