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	400
1994	832
1995	1547
1996	2184
1997	2544
1998	3535
1999	6591
2000	16812
2001	39155
2002	51729
2003	60403
2004	75000
2005	96000
2006	118000
2007	118314
2008	160032
2009	161783
2010	194201
2011	222407
2012	172423
2013	174615
2014	172300
2015	211946
2016	227000