Year	Number of
1980	9877
1981	10838
1982	10949
1983	10212
1984	11439
1985	14937
1986	14071
1987	19723
1988	25700
1989	13342
1990	20122
1991	19626
1992	14802
1993	11601
1994	8449
1995	13423
1996	15020
1997	16660
1998	20249
1999	24157
2000	25821
2001	45842
2002	38628
2003	44445
2004	57553
2005	63990
2006	70734
2007	82417
2008	85674
2009	88589
2010	84121
2011	86778
2012	92818
2013	94825
2014	86464
2015	87211
2016	97279
2017	102387
2018	103921
2019	117320
2020	135784