Year	Annual Number
1970	15260
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	1351
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	12510
1989	0
1990	0
1991	185000
1992	0
1993	38460
1994	2558
1995	0
1996	20010
1997	0
1998	0
1999	10000
2000	0
2001	1437
2002	95050
2003	2501
2004	3058
2005	3003
2006	0
2007	24520
2008	154500