Year	Number
1990	17049
1991	17121
1992	18373
1993	18056
1994	16775
1995	16434
1996	15879
1997	14987
1998	14123
1999	15022
2000	12559
2001	11856
2002	11188
2003	10538
2004	9883
2005	9231
2006	8596
2007	7969
2008	7349
2009	6780
2010	6292
2011	5868
2012	5534
2013	5302
2014	5136
2015	5003
2016	4886
2017	4778
2018	4661
2019	4551
2020	4487
2021	4354
2022	4442