Year	Total
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	0
1997	0
1998	1350
1999	2574
2000	9000
2001	27000
2002	53084
2003	138279
2004	263375
2005	541652
2006	1261757
2007	2168329
2008	3394016
2009	4487123
2010	5275477
2011	6277108
2012	6797852
2013	6737487
2014	7563444
2015	7579439
2016	7613528
2017	7369927