Year	Annual Number
1970	239000
1971	0
1972	0
1973	0
1974	0
1975	1000000
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	2000
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	15110
1992	0
1993	0
1994	2
1995	5002
1996	0
1997	122300
1998	12030
1999	9067
2000	63440
2001	14810
2002	8710
2003	603
2004	28140
2005	58110
2006	24630
2007	4272
2008	10520