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	5000
1984	0
1985	3000
1986	0
1987	0
1988	10000
1989	0
1990	0
1991	0
1992	0
1993	5000
1994	17500
1995	0
1996	0
1997	0
1998	300000
1999	0
2000	0
2001	0
2002	179000
2003	7777
2004	0
2005	50000
2006	0
2007	5308
2008	9981