Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	15020
1977	0
1978	0
1979	40000
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	30000
1987	0
1988	16140
1989	0
1990	48000
1991	0
1992	0
1993	82860
1994	15650
1995	25010
1996	75010
1997	0
1998	0
1999	503000
2000	0
2001	0
2002	980
2003	3115
2004	0
2005	808
2006	1504
2007	15510
2008	313400