Year	Annual Number
1970	0
1971	0
1972	0
1974	0
1975	0
1976	0
1977	9091
1978	3206
1979	215
1980	1040
1981	0
1982	118
1983	0
1984	31510
1985	8443
1986	11860
1987	90
1988	3911
1989	200
1990	18150
1991	185
1992	0
1993	0
1994	5203
1995	0
1996	8777
1997	970
1998	16040
1999	79780
2000	2093
2001	58980
2002	5333
2003	2185
2004	0
2005	156500
2006	0
2007	0
2008	0