Year	Number
1990	35423
1991	33708
1992	31564
1993	29270
1994	26832
1995	24780
1996	23319
1997	22215
1998	21198
1999	20348
2000	19746
2001	19006
2002	18157
2003	17483
2004	16946
2005	16415
2006	15930
2007	15551
2008	15295
2009	14954
2010	14526
2011	14095
2012	13637
2013	13220
2014	12951
2015	12787
2016	12628
2017	12400
2018	12033
2019	11641
2020	11252
2021	10949
2022	10685