Year	Annual Number
1970	3436
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	12460
1980	0
1981	10
1982	0
1983	36450
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	869
1992	1646
1993	3073
1994	37690
1995	18260
1996	0
1997	0
1998	0
1999	1207000
2000	432
2001	0
2002	0
2003	0
2004	8539
2005	0
2006	0
2007	175
2008	0