Year | Value | 2022 | 52.661 | 2021 | 52.18 | 2020 | 51.706 | 2019 | 51.239 | 2018 | 50.779 | 2017 | 50.326 | 2016 | 49.881 | 2015 | 49.444 | 2014 | 49.014 | 2013 | 48.593 | 2012 | 48.172 | 2011 | 47.751 | 2010 | 47.33 | 2009 | 46.91 | 2008 | 46.491 | 2007 | 46.071 | 2006 | 45.652 | 2005 | 45.234 | 2004 | 44.817 | 2003 | 44.399 | 2002 | 43.983 | 2001 | 43.568 | 2000 | 43.155 | 1999 | 42.741 | 1998 | 42.342 | 1997 | 41.964 | 1996 | 41.587 | 1995 | 41.21 | 1994 | 40.835 | 1993 | 40.461 | 1992 | 40.088 | 1991 | 39.716 | 1990 | 39.345 | 1989 | 38.976 | 1988 | 38.608 | 1987 | 38.346 | 1986 | 38.127 | 1985 | 37.91 | 1984 | 37.693 | 1983 | 37.476 | 1982 | 37.26 | 1981 | 37.044 | 1980 | 36.829 | 1979 | 36.614 | 1978 | 36.4 | 1977 | 34.983 | 1976 | 33.594 | 1975 | 32.229 | 1974 | 31.321 | 1973 | 30.513 | 1972 | 29.719 | 1971 | 28.934 | 1970 | 28.163 | 1969 | 27.404 | 1968 | 26.659 | 1967 | 25.926 | 1966 | 25.206 | 1965 | 24.5 | 1964 | 23.007 | 1963 | 21.575 | 1962 | 20.21 | 1961 | 18.911 | 1960 | 17.679 |
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