Year	Annual Number
1970	0
1971	4685
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	52070
1983	0
1984	0
1985	0
1986	0
1987	0
1988	360400
1989	0
1990	0
1991	0
1992	0
1993	123000
1994	0
1995	15120
1996	10770
1997	0
1998	871600
1999	0
2000	2512
2001	24880
2002	302
2003	0
2004	200
2005	13650
2006	0
2007	188900
2008	1403