Year	Number
1972	20195
1974	14160
1976	14228
1978	10540
1979	9757
1980	22973
1981	23893
1982	22554
1983	21746
1984	18254
2005	151941
2006	123891
2010	40512
2012	53979
2015	196986
2018	91506