Year	Number
1960	4018332
1961	4134550
1962	4254464
1963	4378096
1964	4505751
1965	4637026
1966	4772586
1967	4912396
1968	5056803
1969	5205350
1970	5353510
1971	5476921
1972	5604083
1973	5734578
1974	5869057
1975	6007466
1976	6150137
1977	6296596
1978	6447585
1979	6603041
1980	6763337
1981	6927950
1982	7097710
1983	7272557
1984	7452904
1985	7649667
1986	7876037
1987	8109555
1988	8350799.000000001
1989	8599005
1990	8855441
1991	9148137
1992	9515818
1993	9901051
1994	10306434
1995	10732551
1996	11181214
1997	11592022
1998	11996588
1999	12416495
2000	12852959
2001	13304774
2002	13668832
2003	14003132
2004	14347725
2005	14701493
2006	15066204
2007	15441719
2008	15828930
2009	16226580
2010	16636669.000000002
2011	17059047
2012	17494728
2013	17943558
2014	18405971
2015	18882420
2016	19373371
2017	19879305
2018	20400727
2019	20836302
2020	21272284
2021	21704664
2022	22130615
2023	22548654