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	324
1994	2183
1995	4400
1996	5100
1997	7560
1998	18310
1999	44229
2000	90294
2001	164509
2002	237248
2003	466706
2004	738624
2005	1119379
2006	1830220
2007	2502281
2008	3108002
2009	3344563
2010	3962247
2011	4823534
2012	5851723
2013	6808930
2014	7067860
2015	7264151
2016	7745512
2017	8179876
2018	7441527
2019	5788432
2020	5962186
2021	6652490