Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	8016
1977	0
1978	0
1979	30000
1980	40000
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	106400
1991	0
1992	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	0
1999	107100
2000	5500
2001	0
2002	13550
2003	0
2004	0
2005	0
2006	0
2007	24010
2008	14200