Year	Annual Number
1970	2539
1971	159
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	4000
1979	35120
1980	20180
1981	14370
1982	5110
1983	0
1984	0
1985	77
1986	6729
1987	56620
1988	0
1989	75300
1990	27
1991	20820
1992	433
1993	8662
1994	116
1995	5233
1996	0
1997	0
1998	4479
1999	518
2000	744
2001	311
2002	88830
2003	80130
2004	2936
2005	1111
2006	0
2007	622
2008	0