Year	Annual Number
1970	0
1971	27000
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	190000
1980	0
1981	0
1982	85000
1983	100100
1984	0
1985	0
1986	0
1987	0
1988	45000
1989	0
1990	15000
1991	0
1992	65580
1993	0
1994	0
1995	275000
1996	0
1997	75000
1998	55
1999	0
2000	0
2001	0
2002	2765
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0