Year	Number
1971	146014
1972	163021
1973	179011
1974	204238
1975	169564
1976	169747
1977	185313
1978	180626
1979	180828
1980	185083
1988	180126
1990	202666
1991	230679
2011	63452
2016	7852
2017	43418
2018	277826
2019	81583