Year	Number of
1980	5122
1981	3051
1982	9905
1983	13021
1984	20415
1985	26082
1986	27665
1987	27096
1988	30272
1989	31321
1990	21131
1991	33782
1992	37660
1993	36647
1994	38477
1995	42819
1996	45999
1997	45584
1998	58917
1999	59531
2000	61024
2001	66748
2002	70424
2003	80011
2004	93679
2005	97075
2006	95666
2007	99810
2008	104861
2009	111709
2010	114170
2011	110132
2012	108984
2013	112439
2014	115795
2015	119213
2016	130596
2017	150085
2018	169748
2019	178527
2020	200955