Year	Number
1990	53112
1991	52140
1992	50835
1993	49478
1994	47835
1995	46245
1996	44918
1997	43379
1998	41959
1999	40617
2000	39552
2001	38944
2002	38247
2003	36568
2004	34819
2005	33275
2006	32009
2007	30966
2008	30187
2009	28525
2010	27389
2011	26470
2012	25508
2013	24809
2014	24156
2015	23764
2016	23212
2017	22570
2018	21860
2019	21215
2020	20493
2021	19857
2022	19203