Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	1118
1980	1165000
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	870100
1989	0
1990	0
1991	0
1992	0
1993	0
1994	1588000
1995	0
1996	181
1997	0
1998	12220
1999	0
2000	0
2001	0
2002	254
2003	181
2004	324900
2005	28050
2006	15000
2007	115200
2008	247000