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	3000
1985	6900
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	0
1995	600
1996	0
1997	0
1998	0
1999	23800
2000	0
2001	3000
2002	27520
2003	21010
2004	0
2005	7500
2006	10630
2007	54120
2008	0