Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	608000
1975	0
1976	0
1977	0
1978	7500
1979	0
1980	0
1981	0
1982	20130
1983	0
1984	0
1985	0
1986	0
1987	0
1988	12
1989	0
1990	0
1991	0
1992	0
1993	0
1994	0
1995	40
1996	1
1997	0
1998	2127000
1999	0
2000	0
2001	86340
2002	0
2003	0
2004	0
2005	103900
2006	0
2007	19500
2008	0