| Year | Value | | 2024 | 13,468 | | 2023 | 12,828 | | 2022 | 12,208 | | 2021 | 11,740 | | 2020 | 10,958 | | 2019 | 9,871 | | 2018 | 9,075 | | 2017 | 8,538 | | 2016 | 8,256 | | 2015 | 8,573 | | 2014 | 9,236 | | 2013 | 9,825 | | 2012 | 10,311 | | 2011 | 10,614 | | 2010 | 10,671 | | 2009 | 10,531 | | 2008 | 10,263 | | 2007 | 9,963 | | 2006 | 9,711 | | 2005 | 9,480 | | 2004 | 9,259 | | 2003 | 9,091 | | 2002 | 8,942 | | 2001 | 8,725 | | 2000 | 8,391 | | 1999 | 7,988 | | 1998 | 7,509 | | 1997 | 6,998 | | 1996 | 6,509 | | 1995 | 6,063 | | 1994 | 5,625 | | 1993 | 5,137 | | 1992 | 4,616 | | 1991 | 4,134 | | 1990 | 3,775 | | 1989 | 3,634 | | 1988 | 3,780 | | 1987 | 4,181 | | 1986 | 4,709 | | 1985 | 5,235 | | 1984 | 5,642 | | 1983 | 5,840 | | 1982 | 5,827 | | 1981 | 5,696 | | 1980 | 5,514 | | 1979 | 5,318 | | 1978 | 5,170 | | 1977 | 5,095 | | 1976 | 5,058 | | 1975 | 5,013 |
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