Year	Number
1970	389825
1972	393269
1973	418155
1974	470365
1975	542524
1976	643835
1977	769049
1978	875494
1979	1012530
1980	1067912
1981	1388001
1982	1474698
1983	1626437
1984	1747857
1985	1812098
1986	1857658
1987	1952504
1988	2108739
1989	2526147
1990	2788644
1991	2884275
1992	3034710
1993	3091684
1994	3191614
1995	3263050
1996	3447607
1997	3460756
1999	3587665
2000	3780314
2001	3623150
2002	3853618
2003	3928684
2004	4025692
2005	4030045
2006	4502697
2007	4515059
2008	4418713
2009	4782313
2010	4900663
2011	4951956
2012	4782885
2013	4576693
2014	4401780
2015	4335355
2016	4135253
2017	3970016
2019	3970016
2020	3522177
2021	3455710.5
2022	3485293.25
2023	3610603