Year	Annual Number
1970	0
1971	0
1972	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	51
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	752
1991	13150
1992	11660
1993	0
1994	0
1995	0
1996	0
1997	0
1998	0
1999	13540
2000	1387
2001	436
2002	0
2003	4014
2004	0
2005	7636
2006	110
2007	120
2008	0