Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	26
1975	0
1976	0
1977	1004
1978	26
1979	0
1980	0
1981	289
1982	0
1983	0
1984	0
1985	0
1986	0
1987	65510
1988	25
1989	0
1990	0
1991	0
1992	0
1993	15010
1994	11000
1995	4707
1996	7564
1997	307
1998	0
1999	2327
2000	3293
2001	42670
2002	2516
2003	501
2004	15000
2005	0
2006	7172
2007	38000
2008	4011