Year	Number
1970	358
1971	565
1972	640
1973	784
1975	459
1976	481
1977	544
1978	484
1979	465
1980	483
1981	739
1982	948
1983	1030
1986	1279
1990	0
1991	0
1992	0
1993	0
1994	0