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	20
1998	1020
1999	8068
2000	19729
2001	31507
2002	42949
2003	53342
2004	65780
2005	81721
2006	108858
2007	152212
2008	277670
2009	290621
2010	371871
2011	396429
2012	425310
2013	499458
2014	613378
2015	611468
2016	601956
2017	612259