Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	3000000
1976	0
1977	0
1978	2028000
1979	0
1980	630100
1981	0
1982	0
1983	1000000
1984	786200
1985	7658
1986	27840
1987	24
1988	1115000
1989	0
1990	0
1991	16590
1992	0
1993	889400
1994	171400
1995	4281000
1996	5000000
1997	14
1998	0
1999	283800
2000	3311000
2001	470600
2002	3291000
2003	107700
2004	507000
2005	819400
2006	2558000
2007	183100
2008	1540000