Year	Number
1990	35850
1991	37430
1992	41630
1993	43720
1994	42722
1995	42660
1996	39726
1997	38846
1998	38905
1999	40296
2000	38710
2001	37892
2002	36645
2003	34836
2004	32962
2005	31497
2006	29972
2007	27957
2008	25613
2009	23186
2010	21192
2011	19639
2012	18342
2013	17357
2014	16656
2015	15738
2016	15175
2017	14287
2018	13744
2019	13523
2020	13950
2021	13945
2022	17121