Year	Number of
1980	7457
1981	6984
1982	5787
1983	5937
1984	5204
1985	5645
1986	8263
1987	10996
1988	13863
1989	15958
1990	15899
1991	16609
1992	15085
1993	16588
1994	17158
1995	17882
1996	18443
1997	18842
1998	19672
1999	20574
2000	21158
2001	22098
2002	25544
2003	28602
2004	31150
2005	33231
2006	35257
2007	37651
2008	39261
2009	43221
2010	43558
2011	44627
2012	47741
2013	53272
2014	57773
2015	58344
2016	71842
2017	85376
2018	92381
2019	96024
2020	96203