Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	68020
1975	0
1976	0
1977	0
1978	9000
1979	90000
1980	0
1981	0
1982	40000
1983	0
1984	0
1985	0
1986	6000
1987	0
1988	6500
1989	141100
1990	163100
1991	0
1992	0
1993	201900
1994	7031
1995	21850
1996	0
1997	10220
1998	4661
1999	0
2000	1853
2001	205
2002	1209
2003	2000
2004	0
2005	10550
2006	21530
2007	0
2008	9530