Year	Number
1990	52239
1991	79730
1992	47813
1993	46059
1994	44468
1995	42631
1996	40072
1997	36022
1998	30623
1999	25468
2000	21767
2001	19850
2002	19333
2003	19847
2004	20909
2005	22010
2006	22684
2007	22540
2008	21436
2009	19710
2010	17796
2011	15995
2012	14376
2013	12980
2014	11807
2015	10932
2016	10313
2017	9792
2018	9247
2019	8701
2020	8177
2021	7719
2022	7307