Year | Value | 2022 | 28,592 | 2021 | 27,078 | 2020 | 25,685 | 2019 | 25,651 | 2018 | 24,493 | 2017 | 22,793 | 2016 | 23,041 | 2015 | 23,506 | 2014 | 24,138 | 2013 | 24,871 | 2012 | 25,441 | 2011 | 25,932 | 2010 | 26,514 | 2009 | 27,006 | 2008 | 27,392 | 2007 | 27,705 | 2006 | 27,960 | 2005 | 28,168 | 2004 | 28,371 | 2003 | 28,591 | 2002 | 28,834 | 2001 | 29,083 | 2000 | 29,294 | 1999 | 29,453 | 1998 | 29,553 | 1997 | 29,592 | 1996 | 29,573 | 1995 | 29,491 | 1994 | 29,332 | 1993 | 29,082 | 1992 | 28,740 | 1991 | 28,303 | 1990 | 27,929 | 1989 | 27,595 | 1988 | 27,150 | 1987 | 26,671 | 1986 | 26,182 | 1985 | 25,636 | 1984 | 24,989 | 1983 | 24,215 | 1982 | 23,312 | 1981 | 22,306 | 1980 | 21,300 | 1979 | 20,324 | 1978 | 19,359 | 1977 | 18,487 | 1976 | 17,769 | 1975 | 17,254 | 1974 | 16,965 | 1973 | 16,859 | 1972 | 16,858 | 1971 | 16,890 | 1970 | 16,916 | 1969 | 16,894 | 1968 | 16,795 | 1967 | 16,651 | 1966 | 16,496 | 1965 | 16,366 | 1964 | 16,279 | 1963 | 16,238 | 1962 | 16,227 | 1961 | 16,218 | 1960 | 16,139 |
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