Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	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	0
1990	280
1991	0
1992	64850
1993	0
1994	6051
1995	0
1996	180000
1997	0
1998	41940
1999	9419
2000	0
2001	2190
2002	4283
2003	1761
2004	400000
2005	5120
2006	0
2007	17330
2008	0