Year	Annual Number
1970	0
1971	0
1972	3237
1973	56
1974	0
1975	0
1976	139
1977	2840
1978	27
1979	0
1980	117000
1981	30
1982	11
1983	10
1984	5528
1985	5562
1986	2013
1987	0
1988	0
1989	0
1990	3388
1991	15
1992	0
1993	44000
1994	14110
1995	115300
1996	243200
1997	191400
1998	37030
1999	100
2000	3654
2001	23810
2002	145800
2003	3224
2004	5341
2005	18310
2006	74100
2007	8890
2008	11000000