| Year | Value | | 2024 | 39,873 | | 2023 | 39,110 | | 2022 | 38,353 | | 2021 | 37,696 | | 2020 | 37,123 | | 2019 | 36,619 | | 2018 | 36,165 | | 2017 | 35,725 | | 2016 | 35,261 | | 2015 | 34,738 | | 2014 | 34,136 | | 2013 | 33,440 | | 2012 | 32,650 | | 2011 | 31,774 | | 2010 | 30,820 | | 2009 | 29,790 | | 2008 | 28,701 | | 2007 | 27,602 | | 2006 | 26,484 | | 2005 | 25,493 | | 2004 | 24,697 | | 2003 | 23,951 | | 2002 | 22,986 | | 2001 | 21,758 | | 2000 | 20,577 | | 1999 | 19,470 | | 1998 | 18,315 | | 1997 | 17,075 | | 1996 | 16,076 | | 1995 | 15,471 | | 1994 | 15,139 | | 1993 | 14,688 | | 1992 | 14,860 | | 1991 | 14,954 | | 1990 | 13,815 | | 1989 | 12,695 | | 1988 | 12,062 | | 1987 | 11,622 | | 1986 | 11,170 | | 1985 | 10,723 | | 1984 | 10,257 | | 1983 | 9,805 | | 1982 | 9,396 | | 1981 | 8,970 | | 1980 | 8,470 | | 1979 | 7,886 | | 1978 | 7,239 | | 1977 | 6,579 | | 1976 | 5,964 | | 1975 | 5,430 |
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