Year	Number
1983	16225
1984	16464
1985	16638
1986	16670
1987	16801
1988	16892
1989	16594
1990	16070
1991	15687
1992	15328
1993	14748
1994	14047
1995	13228
1996	12277
1997	11262
1998	10275
1999	9393
2000	8603
2001	7867
2002	7268
2003	6877
2004	6664
2005	6502
2006	6369
2007	6299
2008	6231
2009	6117
2010	5912
2011	5693
2012	5466
2013	5167
2014	4816
2015	4399
2016	3895
2017	3281
2018	2815
2019	2663
2020	2444
2021	2173
2022	2018