Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	54900
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	2493
1982	0
1983	567
1984	16
1985	12040
1986	750
1987	0
1988	0
1989	0
1990	318
1991	205100
1992	2140
1993	0
1994	0
1995	0
1996	0
1997	10150
1998	612
1999	0
2000	0
2001	914300
2002	155900
2003	0
2004	13170
2005	5201000
2006	0
2007	0
2008	75490