| Year | Value | | 2023 | 28,348 | | 2022 | 26,861 | | 2021 | 25,023 | | 2020 | 22,989 | | 2019 | 21,464 | | 2018 | 20,524 | | 2017 | 19,993 | | 2016 | 19,569 | | 2015 | 18,882 | | 2014 | 17,065 | | 2013 | 14,314 | | 2012 | 12,319 | | 2011 | 11,180 | | 2010 | 10,208 | | 2009 | 9,023 | | 2008 | 7,826 | | 2007 | 7,033 | | 2006 | 6,570 | | 2005 | 6,328 | | 2004 | 6,168 | | 2003 | 6,010 | | 2002 | 5,844 | | 2001 | 5,656 | | 2000 | 5,446 | | 1999 | 5,252 | | 1998 | 5,092 | | 1997 | 4,965 | | 1996 | 4,860 | | 1995 | 4,780 | | 1994 | 4,714 | | 1993 | 4,623 | | 1992 | 4,475 | | 1991 | 4,285 | | 1990 | 4,136 | | 1989 | 4,032 | | 1988 | 3,911 | | 1987 | 3,784 | | 1986 | 3,655 | | 1985 | 3,526 | | 1984 | 3,393 | | 1983 | 3,244 | | 1982 | 3,089 | | 1981 | 2,937 | | 1980 | 2,805 | | 1979 | 2,694 | | 1978 | 2,587 | | 1977 | 2,477 | | 1976 | 2,371 | | 1975 | 2,279 | | 1974 | 2,199 |
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