Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	112
1976	0
1977	0
1978	144
1979	0
1980	0
1981	0
1982	153
1983	0
1984	0
1985	0
1986	117
1987	240
1988	23
1989	210
1990	92
1991	118
1992	59
1993	21
1994	265
1995	39
1996	361
1997	29
1998	0
1999	247
2000	107
2001	314
2002	0
2003	32
2004	0
2005	19
2006	66
2007	10
2008	10