Year	Number
1970	1413537.25
1971	1658519.625
1972	1851446.875
1973	2200291
1974	2262812.5
1975	2378103.25
1976	2723175.5
1977	3409547.75
1978	3934800.5
1979	4012960.75
1980	3988897.25
1981	4018320.5
1982	3888026
1983	3838114
1984	3859837.5
1985	3996860
1986	4233162
1987	4516205
1988	4748619.5
1989	4936229
1990	5089589.5
1991	5159761
1992	5217611
1993	5307354
1994	5395607
1995	5544621
1996	5807205
1997	6010428.5
1998	6170351.5
1999	6402393.5
2000	6583859
2001	6435498.5
2002	6747693
2003	7122247.5
2004	7510566.5
2005	7868900
2006	8064396
2007	8632129
2008	8862080
2009	8925042
2010	9045302
2011	8836979
2012	8847725
2013	8704468
2014	8788426
2015	9002232
2016	9130529
2017	9159374
2018	9358110
2019	9500274
2020	9669353
2021	9949400
2022	10191659