Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
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	0
1989	0
1990	0
1991	30000
1992	0
1993	21530
1994	0
1995	0
1996	243600
1997	0
1998	3310
1999	19750
2000	0
2001	33
2002	753
2003	15
2004	0
2005	743
2006	2350
2007	2711
2008	25180