Year	Number
1960	507921
1961	543565
1962	602546
1963	667926
1964	740506
1965	820740
1966	909796
1967	1008515
1968	1118104
1969	1239251
1970	1373718
1971	1522776
1972	1688248
1973	1871169
1974	2056297.9999999998
1975	2221055
1976	2399267
1977	2591228
1978	2798845
1979	3023097
1980	3265663
1981	3519136
1982	3775135
1983	4049756
1984	4344775
1985	4660384
1986	4999402
1987	5363083
1988	5753775
1989	6171735
1990	6620697
1991	7041281
1992	7344419
1993	7659719
1994	7989018
1995	8332474
1996	8691200
1997	9064318
1998	9454003
1999	9860440
2000	10284947
2001	10695828
2002	11083051
2003	11484292
2004	11900642
2005	12330879
2006	12777296
2007	13239874
2008	13719871
2009	14215877
2010	14730537
2011	15263828
2012	15816426
2013	16389028.999999998
2014	16982363
2015	17597177
2016	18234249
2017	18894385
2018	19578421
2019	20283552
2020	21005860
2021	21741090
2022	22478117
2023	23209616