Year	Number
1985	4065
1986	3494
1987	3975
1988	4780
1989	4749
1990	5832
1991	7372
1992	10022
1993	12084
1994	11191
1995	10011
1996	11628
1997	12672
1998	13751
1999	15626
2000	25346
2001	30038
2002	39806
2003	56769
2004	65786
2005	93485
2006	122318
2007	153060
2008	194579
2009	229096
2010	293066
2011	415829
2012	535313
2013	704936
2014	801135
2015	968252
2016	1204981
2017	1245709
2018	1393815
2019	1243568
2020	1344817
2021	1426644