Year	Annual Number
1970	0
1971	0
1972	0
1973	146000
1974	20010
1975	0
1976	0
1977	0
1978	0
1979	30000
1980	0
1981	93
1982	8551
1983	0
1984	1524
1985	15030
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	2279
1993	38
1994	31240
1995	0
1996	105
1997	3004
1998	0
1999	714
2000	249
2001	46340
2002	2353
2003	91
2004	27590
2005	1832
2006	60000
2007	1387
2008	59140