Year	Annual Number
1970	0
1971	0
1972	0
1974	0
1975	0
1976	0
1977	30060
1978	163
1979	0
1980	0
1981	0
1982	239
1983	120
1984	4105
1985	0
1986	500800
1987	0
1988	0
1989	0
1990	50
1991	15290
1992	0
1993	0
1994	0
1995	0
1996	5490
1997	197
1998	34110
1999	4701
2000	1744
2001	0
2002	776
2003	0
2004	59070
2005	329
2006	0
2007	35610
2008	0