Year	Annual Number
1970	10350000
1971	166300
1972	0
1973	0
1974	260
1975	34000000
1976	0
1977	1046000
1978	32000000
1979	28010000
1980	32050000
1981	16000000
1982	33500000
1983	250800
1984	19000000
1985	11330000
1986	395300
1987	18300000
1988	22320000
1989	3609
1990	2224
1991	8701000
1992	3072000
1993	128100000
1994	12060000
1995	32710000
1996	7271000
1997	30260000
1998	29650000
1999	27620000
2000	50390000
2001	20610000
2002	42010000
2003	7565000
2004	33210000
2005	28280000
2006	7235000
2007	38150000
2008	12390000