| Year | Value | | 2023 | 14,385 | | 2022 | 14,476 | | 2021 | 14,603 | | 2020 | 14,742 | | 2019 | 14,853 | | 2018 | 14,921 | | 2017 | 14,938 | | 2016 | 14,892 | | 2015 | 14,786 | | 2014 | 14,616 | | 2013 | 14,351 | | 2012 | 13,988 | | 2011 | 13,546 | | 2010 | 13,022 | | 2009 | 12,436 | | 2008 | 11,834 | | 2007 | 11,241 | | 2006 | 10,675 | | 2005 | 10,160 | | 2004 | 9,706 | | 2003 | 9,306 | | 2002 | 8,966 | | 2001 | 8,682 | | 2000 | 8,459 | | 1999 | 8,315 | | 1998 | 8,254 | | 1997 | 8,258 | | 1996 | 8,313 | | 1995 | 8,396 | | 1994 | 8,480 | | 1993 | 8,436 | | 1992 | 8,245 | | 1991 | 8,002 | | 1990 | 7,693 | | 1989 | 7,308 | | 1988 | 6,966 | | 1987 | 6,692 | | 1986 | 6,400 | | 1985 | 6,110 | | 1984 | 5,839 | | 1983 | 5,598 | | 1982 | 5,390 | | 1981 | 5,204 | | 1980 | 5,029 | | 1979 | 4,863 | | 1978 | 4,694 | | 1977 | 4,514 | | 1976 | 4,331 | | 1975 | 4,149 | | 1974 | 3,974 |
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