Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	103
1975	0
1976	0
1977	0
1978	2647
1979	27
1980	82
1981	0
1982	1100
1983	208
1984	29
1985	20
1986	0
1987	22650
1988	0
1989	0
1990	0
1991	0
1992	32
1993	18120
1994	1792
1995	548500
1996	0
1997	0
1998	0
1999	0
2000	7233
2001	11260
2002	0
2003	21270
2004	62220
2005	4431
2006	0
2007	55240
2008	841