Year | Value | 2023 | 15,500 | 2022 | 15,234 | 2021 | 15,019 | 2020 | 14,867 | 2019 | 14,732 | 2018 | 14,601 | 2017 | 14,502 | 2016 | 14,449 | 2015 | 14,442 | 2014 | 14,475 | 2013 | 14,542 | 2012 | 14,634 | 2011 | 14,735 | 2010 | 14,815 | 2009 | 14,873 | 2008 | 14,915 | 2007 | 14,914 | 2006 | 14,842 | 2005 | 14,735 | 2004 | 14,578 | 2003 | 14,319 | 2002 | 13,971 | 2001 | 13,558 | 2000 | 13,060 | 1999 | 12,497 | 1998 | 11,921 | 1997 | 11,352 | 1996 | 10,813 | 1995 | 10,316 | 1994 | 9,870 | 1993 | 9,478 | 1992 | 9,139 | 1991 | 8,847 | 1990 | 8,621 | 1989 | 8,470 | 1988 | 8,395 | 1987 | 8,393 | 1986 | 8,448 | 1985 | 8,530 | 1984 | 8,621 | 1983 | 8,586 | 1982 | 8,402 | 1981 | 8,166 | 1980 | 7,853 | 1979 | 7,460 | 1978 | 7,113 | 1977 | 6,832 | 1976 | 6,538 | 1975 | 6,251 | 1974 | 5,988 |
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