Year	Annual Number
1970	0
1971	0
1972	0
1974	0
1975	0
1976	0
1977	2671
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	6077
1986	8400
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	17100
1995	0
1996	5804
1997	1544
1998	15040
1999	190
2000	3178
2001	144
2002	1284
2003	0
2004	0
2005	212
2006	6020
2007	36820
2008	676