Year	Number of
1988	3446
1989	4913
1990	4650
1991	6844
1992	10113
1993	11076
1994	11510
1995	14428
1996	14364
1997	12013
1998	12383
1999	13085
2000	13651
2001	13029
2002	11677
2003	10413
2004	10016
2005	9063
2006	8468
2007	8427
2008	8290
2009	8562
2010	8916
2011	8636
2012	9867
2013	10325
2014	9628
2015	7654
2016	9412
2017	9693
2018	9743
2019	10224
2020	8860