Year	Number
1971	806
1972	822
1973	761
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	161
1992	0
1993	0
1994	0
1995	0
2001	114
2002	110
2003	109
2004	78
2005	73