Year	Annual Number
1970	0
1971	0
1972	0
1973	360
1974	100100
1975	20
1976	0
1977	0
1978	105
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	1001
1987	1001
1988	0
1989	0
1990	0
1991	0
1992	0
1993	8015
1994	0
1995	6006
1996	0
1997	0
1998	4000
1999	0
2000	431
2001	2670
2002	5003
2003	912
2004	0
2005	263
2006	0
2007	0
2008	0