Year	Annual Number
1970	0
1971	0
1972	2771000
1973	5003
1974	1202000
1975	99
1976	15900
1977	7323
1978	2553
1979	16000
1980	25980
1981	308000
1982	201100
1983	1846
1984	0
1985	5512
1986	618
1987	0
1988	0
1989	307600
1990	712900
1991	893
1992	1054000
1993	348100
1994	811600
1995	129700
1996	96000
1997	105000
1998	0
1999	2105000
2000	165700
2001	91340
2002	155700
2003	3500
2004	21740
2005	193100
2006	732500
2007	86790
2008	1603000