Year	Number
1970	9013411
1971	9252995
1972	9833470
1973	10257471
1974	10644102
1975	11042869
1976	11415553
1977	11597076
1978	11620041
1979	11815722
1980	12260470
1981	12634536
1982	13021613
1983	13359428
1984	13614001
1985	13792619
1986	14053572
1987	14219913
1988	14527909
1989	15025388
1990	15179950
1991	15309269
1992	15437911
1993	15670406
1994	15873080
1995	16055666
1996	16209798
1997	16386151
1998	16452516
1999	16640123
2000	16694290
2001	16776988
2002	16672460
2003	17129216
2004	17639704
2005	17713198
2006	17843602
2007	18223450
2008	18230156
2009	18389286
2010	18569650
2011	18621574
2012	18934976
2013	19508762
2014	19572120
2015	19837204
2016	20242852
2017	19926436
2018	19874026
2019	20477570
2020	20758934
2021	21028528
2022	21043196