Year	Number
1990	6187
1991	5968
1992	5771
1993	5610
1994	5577
1995	5675
1996	5605
1997	5560
1998	5489
1999	5406
2000	5314
2001	5231
2002	5150
2003	5068
2004	5005
2005	4950
2006	4905
2007	4887
2008	4880
2009	4872
2010	4860
2011	4853
2012	4838
2013	4822
2014	4822
2015	4802
2016	4791
2017	4789
2018	4797
2019	4823
2020	4873
2021	4914
2022	4956