Year	Number
1971	3177739
1972	3198670
1973	3300153
1974	3358693
1976	3475749
1977	3564473
1978	3711464
1979	3837800
1980	3968300
1981	4148342
1982	4405947
1983	4537790
1984	4638735
1985	4615888
1986	4710616
1987	5009850
1988	5046471
1989	5202508
1990	4848158
1991	5384539
1992	5869297
1993	5919339
1994	5896026
1995	5530502
1996	5413752
1997	5136152
1999	4732947
2000	4857955
2001	4781543
2002	4778851
2003	4889325
2004	4932646
2005	4948198
2006	4969445
2007	5013582
2008	5109630
2009	5094623
2010	5125942
2014	5177276
2016	5321524
2017	5388349
2018	5299765