Year	Annual Number
1970	10070
1971	0
1972	2510000
1973	0
1974	0
1975	10060
1976	508900
1977	30010
1978	18070
1979	0
1980	0
1981	118100
1982	70090
1983	13600
1984	100300
1985	0
1986	84410
1987	0
1988	0
1989	55390
1990	0
1991	250000
1992	0
1993	0
1994	540300
1995	0
1996	100000
1997	600200
1998	0
1999	0
2000	1106000
2001	0
2002	528100
2003	162800
2004	1033000
2005	8063
2006	6520
2007	222600
2008	533300