Year	Number
1960	0
1965	0
1970	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	2311
1997	14427
1998	34896
1999	78588
2000	155271
2001	237629
2002	326508
2003	379362
2004	707201
2005	1281462
2006	2240756
2007	4184834
2008	6210711
2009	8390755
2010	9505071
2011	8062229
2012	7370034
2013	7767235
2014	7725092
2015	8048388
2016	7832802
2017	8233499
2018	7588554
2019	7559829
2020	6960654
2021	7560710
2022	7937385