Year	Annual Number
1970	204200
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	4079000
1979	0
1980	628100
1981	0
1982	0
1983	0
1984	38030
1985	2800000
1986	165
1987	0
1988	0
1989	0
1990	10280
1991	295800
1992	109800
1993	15060
1994	382300
1995	400300
1996	375200
1997	0
1998	32550
1999	5784000
2000	5026000
2001	1609000
2002	1432000
2003	417000
2004	35110
2005	92580
2006	52300
2007	962400
2008	632700