Year	Number
1971	314629
1972	378812
1973	424983
1974	482304
1975	546085
1976	571389
1977	583039
1978	586759
1979	611983
1980	667222
1981	691245
1982	754588
1983	736816
1984	707699
1985	757334
1986	794782
1987	862834
1988	901327
1989	1034341
1990	1144880
1991	1212337
1992	1476592
1993	1589948
1994	1726325
1995	2588662
1996	2604130
1998	2525323
1999	2581698
2000	2694645
2001	2845836
2002	2846589
2004	2841640
2005	2868038
2006	2933557
2007	2943248
2008	3197928
2009	3250111
2010	3417404
2011	3564199
2012	3687625
2013	3951611
2014	4096614
2015	4204502
2016	4280527
2017	4433977
2018	4441839
2019	4593328
2021	4279070
2022	4287735