| Year | Value | | 2022 | 17,436 | | 2021 | 16,970 | | 2020 | 16,514 | | 2019 | 16,009 | | 2018 | 15,483 | | 2017 | 14,987 | | 2016 | 14,544 | | 2015 | 13,989 | | 2014 | 13,392 | | 2013 | 12,742 | | 2012 | 12,023 | | 2011 | 11,302 | | 2010 | 10,636 | | 2009 | 10,016 | | 2008 | 9,432 | | 2007 | 8,881 | | 2006 | 8,403 | | 2005 | 7,994 | | 2004 | 7,622 | | 2003 | 7,290 | | 2002 | 7,036 | | 2001 | 6,820 | | 2000 | 6,586 | | 1999 | 6,348 | | 1998 | 6,080 | | 1997 | 5,779 | | 1996 | 5,372 | | 1995 | 5,012 | | 1994 | 4,701 | | 1993 | 4,419 | | 1992 | 4,175 | | 1991 | 3,972 | | 1990 | 3,796 |
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