Year	Annual Number
1970	0
1971	0
1972	0
1973	1005
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	20880
1983	0
1984	0
1985	0
1986	0
1987	6599
1988	6000
1989	10
1990	0
1991	0
1992	0
1993	0
1994	610
1995	7466
1996	0
1997	0
1998	0
1999	6035
2000	3022
2001	0
2002	98740
2003	0
2004	0
2005	0
2006	0
2007	2107
2008	180000