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	224
1988	401
1989	636
1990	953
1991	1239
1992	1974
1993	2269
1994	2709
1995	3185
1996	6500
1997	7656
1998	38998
1999	55258
2000	119165
2001	389208
2002	574334
2003	1917530
2004	3735695
2005	5680726
2006	7339047
2007	7842619
2008	8602164
2009	9797026
2010	11114206
2011	12387656
2012	12843889
2013	12712365
2014	14283633
2015	14595875
2016	14282078
2017	14334080
2018	14769594
2019	14771048
2020	14852857
2021	15644663
2022	15971243