Year	Annual Number
1970	13
1971	3
1972	0
1973	0
1974	45720
1975	0
1976	0
1977	0
1978	105
1979	15
1980	0
1981	0
1982	1
1983	0
1984	0
1985	27
1986	1019
1987	0
1988	1
1989	4
1990	0
1991	408
1992	122
1993	12070
1994	2860000
1995	431800
1996	622800
1997	0
1998	0
1999	10700
2000	1351
2001	209
2002	129
2003	2071
2004	648
2005	1201
2006	9030
2007	822
2008	12000