Year	Annual Number
1970	14110
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	288
1981	0
1982	0
1983	21870
1984	13
1985	201700
1986	4616000
1987	1387000
1988	237600
1989	38010000
1990	5902000
1991	3357000
1992	16230000
1993	8650000
1994	26140000
1995	6569000
1996	15320000
1997	7273000
1998	11000000
1999	2182000
2000	2532000
2001	21170000
2002	107400000
2003	9480000
2004	9792000
2005	40780000
2006	55340000
2007	9005000
2008	1649000