Year	Number
1972	34163
1974	28893
1976	25851
1978	20185
1979	19004
1980	27669
1981	28103
1982	25689
1983	23059
1984	20727
2005	125948
2006	139392
2010	50756
2012	27492
2015	196219
2018	96666