Year	Number
1970	10425
1971	11538
1972	11625
1973	12830
1974	14773
1976	11587
1980	9321
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	0
2010	133778
2011	150783
2012	148131
2013	149818
2016	110625
2017	99702
2018	105865