Year	Number
1971	4985800
1972	5034800
1973	5067500
1974	5072300
1976	4874000
1977	4737600
1978	4578600
1979	4417900
1980	4301200
1981	4252524
1982	4203200
1983	4209400
1984	4207900
1985	4219000
1986	4246800
1988	4277000
1990	4273500
1991	4230100
1992	4180900
1993	4156700
1994	4202200
1998	4679759
1999	4859733
2000	4851482
2001	4777496
2002	4649313
2003	4497864
2004	4126341
2005	3723247
2006	3584974
2007	3411430
2008	3216245
2009	3016333
2010	2891266
2011	2667758
2012	2642154
2013	2532019
2014	2470546
2015	2177134
2016	2139673
2017	2155989
2018	2199778