Year	Annual Number
1970	37
1971	158
1972	256
1973	296
1974	352
1975	302
1976	0
1977	91
1978	215
1979	2346
1980	582
1981	30
1982	52000
1983	6132
1984	15770
1985	1021000
1986	81
1987	3351
1988	27
1989	25210
1990	10830
1991	3087
1992	295200
1993	891
1994	21920
1995	86310
1996	4418
1997	5072
1998	153800
1999	3059000
2000	23500
2001	180500
2002	19170
2003	243700
2004	5080000
2005	832200
2006	5756
2007	8562
2008	2301000