Year	Annual Number
1970	0
1971	0
1972	0
1973	44350
1974	0
1975	0
1976	0
1977	0
1978	0
1979	750
1980	0
1981	0
1982	30120
1983	0
1984	0
1985	0
1986	2523
1987	0
1988	0
1989	0
1990	152000
1991	0
1992	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	0
1999	0
2000	0
2001	0
2002	0
2003	27010
2004	0
2005	0
2006	0
2007	6516
2008	0