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	20390
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	0
1995	6200000
1996	3270000
1997	29000
1998	10220
1999	42180
2000	0
2001	187700
2002	58440
2003	0
2004	199700
2005	16490
2006	92100
2007	1171000
2008	0