Year	Number
1971	4149067
1972	4279612
1973	4424528
1974	4829346
1975	4990440
1976	5154371
1977	5285143
1978	5344922
1979	5380774
1980	5360097
1981	5341849
1982	5329275
1983	5296000
1984	5173000
1985	5024000
1986	4877000
1987	4688000
1988	4508000
1989	4365912
1990	4284000
1991	4335600
1992	4433500
1993	4868593
1994	4938261
1995	4986597
1996	5000486
1997	4975266
1998	5012393
1999	5202387
2000	5314730
2001	5376980
2002	5518839
2003	5541262
2004	5712635
2005	5760887
2006	5357793
2007	5306369
2008	5356450
2009	5429636
2010	5538230
2011	5000332
2012	4849275
2013	6496973
2014	6556991.5
2015	6374675
2017	6386316.5
2018	6173690.5
2019	6138912
2020	6134958
2021	6200752.5
2022	6302652