| Year | Value | | 2024 | 19,472 | | 2023 | 18,553 | | 2022 | 17,681 | | 2021 | 16,918 | | 2020 | 16,262 | | 2019 | 15,694 | | 2018 | 15,198 | | 2017 | 14,747 | | 2016 | 14,299 | | 2015 | 13,906 | | 2014 | 13,642 | | 2013 | 13,468 | | 2012 | 13,260 | | 2011 | 12,952 | | 2010 | 12,573 | | 2009 | 12,119 | | 2008 | 11,593 | | 2007 | 11,009 | | 2006 | 10,412 | | 2005 | 9,865 | | 2004 | 9,426 | | 2003 | 9,179 | | 2002 | 9,155 | | 2001 | 9,128 | | 2000 | 8,877 | | 1999 | 8,305 | | 1998 | 7,655 | | 1997 | 7,208 | | 1996 | 6,921 | | 1995 | 6,755 | | 1994 | 6,778 | | 1993 | 6,970 | | 1992 | 7,144 | | 1991 | 7,219 | | 1990 | 7,197 | | 1989 | 7,106 | | 1988 | 6,977 | | 1987 | 6,814 | | 1986 | 6,616 | | 1985 | 6,389 | | 1984 | 6,137 | | 1983 | 5,873 | | 1982 | 5,605 | | 1981 | 5,342 | | 1980 | 5,081 | | 1979 | 4,845 | | 1978 | 4,658 | | 1977 | 4,514 | | 1976 | 4,410 | | 1975 | 4,349 |
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