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	353
1994	378
1995	564
1996	561
1997	619
1998	620
1999	800
2000	16320
2001	33416
2002	52000
2003	64000
2004	100560
2005	153000
2006	200000
2007	270000
2008	480584
2009	920749
2010	1678029
2011	1914586
2012	2247126
2013	2536831
2014	3193257
2015	4997696
2016	5357816
2017	5920612