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	0
1999	6740
2000	17757
2001	27500
2002	50369
2003	51324
2004	155534
2005	410630
2006	866700
2007	1208498
2008	1954527
2009	4051703
2010	6854000
2011	14126659
2012	20523889
2013	25646865
2014	30490000
2015	42311629
2016	51224000
2017	62617000