Year	Number
1971	19343
1972	20447
1975	27312
1976	31492
1977	32923
1978	36321
1979	32196
1980	35782
1981	36815
1982	38270
1983	42419
1984	46585
1985	47882
1987	53102
1989	52747
1990	59780
2014	303126
2015	326239
2016	342540
2017	396126
2018	396110
2019	786810
2021	803818