Year	Number
1970	2247818
1971	2314790
1972	2474526
1973	2608284.5
1974	2704155
1975	2819910.25
1976	2945940.5
1977	3093010.25
1978	3237399
1979	3412357.75
1980	3589063.75
1981	3780078
1982	3976616.5
1983	4306780
1984	4521823.5
1985	4793641.5
1986	5024290
1987	5258483.5
1988	5438399
1989	5544165
1990	5844479
1991	6066793.5
1992	6249032
1993	6445769.5
1994	6635385
1995	6817470
1996	7008781
1997	7236272.5
1998	7347267.5
1999	7434117.5
2000	7723160.5
2001	7902957
2002	8327938.5
2003	8698970
2004	8908020
2005	9494669
2006	10013616
2007	10576613
2008	11208584
2009	11629313
2010	12085002
2011	12163563
2012	11971335
2013	12028122
2014	12485734
2015	12845779
2016	13683318
2017	13847977
2018	14716131
2019	15604258
2020	16230158
2021	16331421
2022	16435180