Year	Annual Number
1970	1302000
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	1023
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	2
1987	0
1988	0
1989	0
1990	0
1991	0
1992	1002
1993	0
1994	17370
1995	0
1996	517
1997	0
1998	0
1999	0
2000	46070
2001	2
2002	10020
2003	1353
2004	202
2005	0
2006	0
2007	0
2008	309