Year	Number of
1980	2702
1982	13916
1983	13681
1984	13133
1985	13832
1986	12917
1987	11212
1988	11325
1989	11039
1990	11607
1991	11332
1992	11428
1993	13345
1994	13345
1995	13507
1996	15329
1997	16522
1998	15324
1999	16647
2000	18572
2001	18250
2002	18934
2003	19730
2004	19929
2005	21336
2006	21143
2007	21369
2008	20588
2009	21701
2010	22336
2011	21429
2012	21880
2013	20701
2014	22517
2015	23705
2016	22801
2017	23077
2018	23465
2019	20879
2020	17212