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	395
1990	277
1991	123
1992	83
1993	177
1994	407
1995	39
1996	361
1997	29
1998	0
1999	327
2000	107
2001	330
2002	0
2003	34
2004	0
2005	19
2006	67
2007	10
2008	10