Year	Annual Number
1970	7028
1971	0
1972	1129000
1973	0
1974	0
1975	0
1976	0
1977	76320
1978	2027
1979	0
1980	0
1981	0
1982	0
1983	0
1984	351300
1985	0
1986	0
1987	154000
1988	0
1989	0
1990	189400
1991	1590
1992	283
1993	0
1994	0
1995	0
1996	60450
1997	130
1998	121400
1999	30270
2000	3109
2001	310100
2002	4028
2003	0
2004	4701
2005	14530
2006	4676
2007	1003
2008	23