Year	Number of
1985	4840
1986	4427
1987	3640
1988	2815
1989	3703
1990	2671
1991	2500
1992	1756
1993	5500
1995	1540
1996	9628
1997	9947
1998	11147
1999	10035
2000	10799
2001	13064
2002	13282
2003	14490
2004	15026
2005	14920
2006	14673
2007	13859
2008	13440
2009	11980
2010	11281
2011	10806
2012	10003
2013	9597
2014	9114
2015	9614
2016	8857
2017	8575
2018	7808
2019	7801
2020	6509