Year | Value | 2022 | 39.711 | 2021 | 38.946 | 2020 | 38.177 | 2019 | 37.405 | 2018 | 36.632 | 2017 | 35.858 | 2016 | 35.083 | 2015 | 34.308 | 2014 | 33.535 | 2013 | 32.762 | 2012 | 31.993 | 2011 | 31.225 | 2010 | 30.462 | 2009 | 29.709 | 2008 | 28.968 | 2007 | 28.237 | 2006 | 27.517 | 2005 | 26.809 | 2004 | 26.114 | 2003 | 25.429 | 2002 | 24.756 | 2001 | 24.096 | 2000 | 23.59 | 1999 | 23.202 | 1998 | 22.818 | 1997 | 22.438 | 1996 | 22.064 | 1995 | 21.693 | 1994 | 21.328 | 1993 | 20.966 | 1992 | 20.61 | 1991 | 20.257 | 1990 | 19.811 | 1989 | 19.33 | 1988 | 18.859 | 1987 | 18.395 | 1986 | 17.941 | 1985 | 17.496 | 1984 | 17.06 | 1983 | 16.631 | 1982 | 16.212 | 1981 | 15.801 | 1980 | 14.851 | 1979 | 13.701 | 1978 | 12.629 | 1977 | 11.63 | 1976 | 10.701 | 1975 | 9.836 | 1974 | 9.034 | 1973 | 8.553 | 1972 | 8.221 | 1971 | 7.901 | 1970 | 7.593 | 1969 | 7.296 | 1968 | 7.009 | 1967 | 6.733 | 1966 | 6.467 | 1965 | 6.211 | 1964 | 5.964 | 1963 | 5.727 | 1962 | 5.498 | 1961 | 5.278 | 1960 | 5.135 |
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