Year	Number
1970	8067885
1971	8612076
1972	9262602
1973	9840391
1974	10157006
1975	10551088
1976	10982062
1977	12624571
1978	14892927
1979	17074654
1980	18391170
1981	20071448
1982	22057148
1983	22904798
1984	23426414
1985	23548970
1986	22440532
1987	22695066
1988	22848066
1989	23290800
1990	24444250
1991	25111928
1992	26400424
1993	27898618
1994	28698194
1995	28819438
1996	27612626
1997	29679122
1998	31629938
1999	33662824
2000	35906812
2001	37072416
2002	38849328
2003	40215756
2004	42229688
2005	43821784
2006	45446732
2007	45392364
2008	45481352
2009	47810924
2010	49762224
2011	53312656
2012	55914780
2013	58310760
2014	59074840
2015	60213272
2016	61047148
2017	62918760
2018	64573820
2019	66877088
2020	68800760
2021	70216776
2022	71722488