Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	5016000
1977	0
1978	0
1979	2040
1980	0
1981	0
1982	20
1983	0
1984	0
1985	5000
1986	2500
1987	0
1988	2055
1989	0
1990	0
1991	23900
1992	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	0
1999	282
2000	0
2001	158
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0