Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	16000
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	80020
1989	0
1990	0
1991	0
1992	0
1993	0
1994	62050
1995	0
1996	0
1997	0
1998	20000
1999	24410
2000	4161
2001	20000
2002	0
2003	30010
2004	0
2005	0
2006	46480
2007	57280
2008	33000