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	290
1993	340
1994	625
1995	1539
1996	3790
1997	4915
1998	6453
1999	12078
2000	12681
2001	29545
2002	55160
2003	112275
2004	204191
2005	657528
2006	1009565
2007	1478409
2008	2022133
2009	3234642
2010	4003395
2011	5480851
2012	4300000
2013	4612612
2014	4618586
2015	3727162
2016	3958510
2017	3711813
2018	3662336
2019	4636926
2020	4636690
2021	4822973