Year	Number
1990	17749
1991	16881
1992	16012
1993	14855
1994	13775
1995	12990
1996	12507
1997	12016
1998	11443
1999	11032
2000	10779
2001	10290
2002	9931
2003	9635
2004	9386
2005	9044
2006	8822
2007	8614
2008	8584
2009	8328
2010	8198
2011	7940
2012	7754
2013	7540
2014	7538
2015	7449
2016	7441
2017	7261
2018	7060
2019	6866
2020	6678
2021	6597
2022	6455