Year	Annual Number
1970	10000000
1971	0
1972	50
1973	427
1974	38030000
1975	0
1976	4000000
1977	213700
1978	400000
1979	0
1980	10000000
1981	0
1982	308000
1983	7160000
1984	30000000
1985	500000
1986	400000
1987	29700000
1988	45000000
1989	200200
1990	2012000
1991	2990000
1992	75220
1993	15750000
1994	395200
1995	14720000
1996	5828000
1997	900100
1998	15000000
1999	495600
2000	2679000
2001	700000
2002	1500000
2003	550300
2004	36870000
2005	1150000
2006	211800
2007	13850000
2008	617900