| Year | Value | | 2022 | 48,538 | | 2021 | 46,387 | | 2020 | 44,227 | | 2019 | 42,027 | | 2018 | 39,871 | | 2017 | 37,861 | | 2016 | 36,155 | | 2015 | 34,489 | | 2014 | 32,913 | | 2013 | 31,443 | | 2012 | 30,282 | | 2011 | 29,320 | | 2010 | 28,336 | | 2009 | 27,394 | | 2008 | 26,463 | | 2007 | 25,331 | | 2006 | 24,189 | | 2005 | 23,168 | | 2004 | 22,238 | | 2003 | 21,391 | | 2002 | 20,676 | | 2001 | 20,037 | | 2000 | 19,406 | | 1999 | 18,764 | | 1998 | 18,061 | | 1997 | 17,330 | | 1996 | 16,322 | | 1995 | 15,377 | | 1994 | 14,475 | | 1993 | 13,605 | | 1992 | 12,755 | | 1991 | 11,949 | | 1990 | 11,207 |
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