Year	Annual Number
1970	0
1971	0
1972	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	110
1980	0
1981	4565
1982	0
1983	0
1984	5524
1985	0
1986	0
1987	507
1988	206
1989	0
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	2553
1997	10760
1998	0
1999	0
2000	0
2001	0
2002	315
2003	1322
2004	0
2005	211
2006	160
2007	0
2008	0