Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	40000
1978	0
1979	0
1980	0
1981	30000
1982	0
1983	0
1984	0
1985	0
1986	0
1987	30000
1988	0
1989	50030
1990	0
1991	0
1992	0
1993	0
1994	100
1995	8520
1996	103
1997	1234000
1998	0
1999	0
2000	373500
2001	6500
2002	0
2003	301
2004	1500
2005	7532
2006	486600
2007	10040
2008	52000