Year | Value | 2022 | 19,194 | 2021 | 19,315 | 2020 | 19,585 | 2019 | 19,984 | 2018 | 20,338 | 2017 | 20,686 | 2016 | 20,934 | 2015 | 20,920 | 2014 | 20,891 | 2013 | 20,975 | 2012 | 21,120 | 2011 | 21,365 | 2010 | 21,867 | 2009 | 22,536 | 2008 | 23,216 | 2007 | 23,830 | 2006 | 24,278 | 2005 | 24,591 | 2004 | 24,759 | 2003 | 24,621 | 2002 | 24,223 | 2001 | 23,941 | 2000 | 23,785 | 1999 | 23,776 | 1998 | 23,784 | 1997 | 23,848 | 1996 | 23,883 | 1995 | 23,850 | 1994 | 23,808 | 1993 | 23,775 | 1992 | 23,777 | 1991 | 23,871 | 1990 | 24,118 | 1989 | 24,563 | 1988 | 25,187 | 1987 | 25,902 | 1986 | 26,573 | 1985 | 27,072 | 1984 | 27,322 | 1983 | 27,311 | 1982 | 27,081 | 1981 | 26,719 | 1980 | 26,360 | 1979 | 26,133 | 1978 | 26,055 | 1977 | 26,082 | 1976 | 26,123 | 1975 | 26,065 | 1974 | 25,792 | 1973 | 25,242 | 1972 | 24,414 | 1971 | 23,354 | 1970 | 22,128 | 1969 | 20,944 | 1968 | 19,996 | 1967 | 19,409 | 1966 | 19,313 | 1965 | 19,807 | 1964 | 20,778 | 1963 | 21,945 | 1962 | 23,000 | 1961 | 23,684 | 1960 | 23,811 |
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