Year	Number
1970	44941
1971	47570
1972	48440
1973	51991
1974	59406
1975	62031
1976	66094
1977	70944
1978	74126
1979	77868
1980	78715
1981	75051
1982	77246
1983	80623
1984	83004
1985	95915
1986	104656
1987	116347
1988	132282
1989	146428
1991	184403
1992	191651
1993	198421
1994	204258
1995	211425
1996	213346
1997	236886
2010	1825956
2014	1947349
2015	1774383
2016	1807674
2017	1920524
2018	2148466
2019	2338457
2020	2473506
2021	2338457