Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	54
1978	105000
1979	0
1980	0
1981	0
1982	0
1983	0
1984	350100
1985	0
1986	0
1987	0
1988	4100
1989	0
1990	0
1991	0
1992	0
1993	0
1994	2502000
1995	0
1996	200000
1997	0
1998	0
1999	0
2000	1436
2001	0
2002	4020
2003	23020
2004	0
2005	0
2006	0
2007	162800
2008	220000