Year | Value | 2022 | 39.188 | 2021 | 38.546 | 2020 | 37.908 | 2019 | 37.273 | 2018 | 36.642 | 2017 | 36.016 | 2016 | 35.394 | 2015 | 34.777 | 2014 | 34.165 | 2013 | 33.559 | 2012 | 32.958 | 2011 | 32.364 | 2010 | 31.776 | 2009 | 31.194 | 2008 | 30.619 | 2007 | 30.051 | 2006 | 29.49 | 2005 | 28.936 | 2004 | 28.39 | 2003 | 27.849 | 2002 | 27.315 | 2001 | 26.787 | 2000 | 26.267 | 1999 | 25.752 | 1998 | 25.244 | 1997 | 24.743 | 1996 | 24.249 | 1995 | 23.76 | 1994 | 23.225 | 1993 | 22.636 | 1992 | 22.058 | 1991 | 21.489 | 1990 | 20.931 | 1989 | 20.385 | 1988 | 19.849 | 1987 | 19.323 | 1986 | 18.808 | 1985 | 18.373 | 1984 | 17.993 | 1983 | 17.619 | 1982 | 17.251 | 1981 | 16.889 | 1980 | 16.534 | 1979 | 16.183 | 1978 | 15.84 | 1977 | 15.502 | 1976 | 15.171 | 1975 | 14.844 | 1974 | 14.524 | 1973 | 14.209 | 1972 | 13.901 | 1971 | 13.598 | 1970 | 13.3 | 1969 | 12.815 | 1968 | 12.347 | 1967 | 11.891 | 1966 | 11.451 | 1965 | 11.026 | 1964 | 10.614 | 1963 | 10.216 | 1962 | 9.831 | 1961 | 9.459 | 1960 | 9.1 |
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