Year	Number
1970	20962356
1971	22124536
1972	23390560
1973	24659278
1974	26540612
1975	28042136
1976	29804982
1977	32848000
1978	36519376
1979	40566460
1980	42999056
1981	45121024
1982	46922152
1983	48084580
1984	49021096
1985	48788364
1986	48325260
1987	48605660
1988	49326400
1989	49695856
1990	50955324
1991	53036776
1992	54044740
1993	56662904
1994	58258760
1995	60164668
1996	59157372
1997	64437664
1998	66976024
1999	69515544
2000	73518400
2001	77315928
2002	83639448
2003	90206392
2004	95266920
2005	99200688
2006	103796552
2007	107630016
2008	111553920
2009	115526840
2010	119304328
2011	124471864
2012	129809336
2013	134174664
2014	136994416
2015	138931616
2016	142467600
2017	147362240
2018	152705120
2019	157905392
2020	162601104
2021	166873680
2022	170553952