Year	Annual Number
1970	10000
1971	0
1972	0
1973	0
1974	20000
1975	10000
1976	242000
1977	0
1978	0
1979	82
1980	0
1981	150
1982	10
1983	34
1984	0
1985	90
1986	0
1987	0
1988	939
1989	42
1990	127
1991	1
1992	0
1993	0
1994	1
1995	71
1996	353
1997	32
1998	55
1999	0
2000	9
2001	8
2002	2
2003	317
2004	4
2005	16
2006	23
2007	3
2008	87560