Year	Number
1990	30524
1991	29210
1992	27963
1993	26878
1994	25951
1995	25299
1996	24288
1997	23516
1998	22709
1999	23578
2000	21006
2001	20144
2002	19306
2003	18507
2004	17724
2005	16970
2006	16232
2007	15467
2008	14678
2009	13897
2010	13160
2011	13185
2012	11899
2013	11439
2014	11057
2015	10733
2016	10447
2017	10195
2018	9960
2019	9763
2020	9641
2021	9529
2022	9417