Year	Number
1980	49767
1981	47730
1982	45909
1983	44564
1984	43815
1985	43236
1986	42686
1987	41767
1988	40404
1989	39480
1990	39705
1991	40424
1992	40483
1993	39964
1994	39207
1995	38339
1996	37040
1997	35057
1998	32653
1999	30332
2000	28498
2001	27027
2002	25682
2003	24043
2004	22588
2005	21429
2006	20450
2007	19936
2008	19427
2009	18563
2010	17245
2011	15768
2012	14577
2013	13790
2014	13233
2015	12651
2016	11950
2017	11253
2018	11015
2019	10942
2020	10735
2021	10192
2022	9383