Year	Annual Number
1971	0
1972	0
1973	0
1975	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	170
1990	117
1991	182
1992	0
1993	0
1994	29
1995	120
1996	200
1997	33
1998	34120
1999	0
2000	49
2001	2006
2002	50700
2003	415
2004	0
2005	1100
2006	0
2007	100100
2008	0