| Year | Value | | 2024 | 16,868 | | 2023 | 16,960 | | 2022 | 16,987 | | 2021 | 17,087 | | 2020 | 16,882 | | 2019 | 16,226 | | 2018 | 15,563 | | 2017 | 14,913 | | 2016 | 14,283 | | 2015 | 13,690 | | 2014 | 13,120 | | 2013 | 12,578 | | 2012 | 12,071 | | 2011 | 11,605 | | 2010 | 11,149 | | 2009 | 10,645 | | 2008 | 10,107 | | 2007 | 9,566 | | 2006 | 9,035 | | 2005 | 8,537 | | 2004 | 8,102 | | 2003 | 7,722 | | 2002 | 7,382 | | 2001 | 7,091 | | 2000 | 6,859 | | 1999 | 6,778 | | 1998 | 6,866 | | 1997 | 7,087 | | 1996 | 7,336 | | 1995 | 7,510 | | 1994 | 7,559 | | 1993 | 7,441 | | 1992 | 7,120 | | 1991 | 6,667 | | 1990 | 6,214 | | 1989 | 5,900 | | 1988 | 5,789 | | 1987 | 5,765 | | 1986 | 5,670 | | 1985 | 5,483 | | 1984 | 5,311 | | 1983 | 5,205 | | 1982 | 5,076 | | 1981 | 4,829 | | 1980 | 4,520 | | 1979 | 4,282 | | 1978 | 4,136 | | 1977 | 4,015 | | 1976 | 3,885 | | 1975 | 3,762 |
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