Year	Annual Number
1970	0
1971	0
1972	0
1974	31500
1975	107
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	300
1985	0
1986	34720
1987	0
1988	170
1989	0
1990	0
1991	15440
1992	0
1993	0
1994	0
1995	112900
1996	0
1997	25900
1998	214400
1999	238
2000	0
2001	0
2002	317800
2003	0
2004	0
2005	0
2006	0
2007	0
2008	162800