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	150
1994	450
1995	500
1996	600
1997	750
1998	850
1999	1000
2000	1200
2001	1500
2010	6200
2011	6700
2012	6800
2015	9400
2016	9900