Year	Number
1990	24005
1991	24664
1992	31884
1993	32563
1994	28993
1995	27127
1996	26342
1997	25540
1998	25113
1999	25896
2000	24267
2001	23472
2002	22717
2003	22057
2004	21560
2005	21292
2006	21214
2007	20968
2008	20386
2009	19070
2010	18105
2011	17143
2012	16257
2013	15436
2014	15254
2015	14209
2016	14126
2017	12779
2018	12025
2019	11469
2020	12125
2021	11006
2022	16445