Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	87
1981	0
1982	0
1983	14000
1984	20100
1985	8109
1986	230100
1987	0
1988	1667000
1989	12320
1990	24510
1991	256800
1992	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	0
1999	0
2000	0
2001	0
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0