Year	Annual Number
1970	0
1971	0
1972	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	1853
1980	0
1981	11100
1982	0
1983	0
1984	1000
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	37
1992	0
1993	0
1994	0
1995	0
1996	45100
1997	20270
1998	467
1999	0
2000	0
2001	23800
2002	0
2003	8204
2004	3310
2005	615
2006	8186
2007	22260
2008	2250