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	2072
1991	2653
1992	4488
1993	6833
1994	7456
1995	14806
1996	21342
1997	25498
1998	37718
1999	78858
2000	191242
2001	366557
2002	545670
2003	925198
2004	1186771
2005	1456248
2006	1800210
2007	2243436
2008	2578876
2009	2844302
2010	2859688
2011	2762519
2012	2723420
2013	2948332
2014	2966749
2015	2898111
2016	3050173
2017	3103450
2018	2281136
2019	3289299
2020	3466524
2021	3414124