Year	Number
1960	219427
1961	233134
1962	251373
1963	271039
1964	292274
1965	315108
1966	339760
1967	366341
1968	395043
1969	425905
1970	459225
1971	488590
1972	514049.99999999994
1973	540761
1974	568901
1975	598504
1976	629692
1977	662412
1978	696882
1979	733145
1980	771349
1981	811430
1982	853654
1983	898124
1984	964072
1985	1034661
1986	1110527
1987	1191955
1988	1279479
1989	1373162
1990	1473848
1991	1581917
1992	1698075
1993	1822407
1994	1940528
1995	2066306
1996	2200426
1997	2342847
1998	2494701
1999	2656398
2000	2828820
2001	3011913
2002	3207133
2003	3415007
2004	3636670
2005	3872050
2006	4123020.9999999995
2007	4390259
2008	4675223
2009	4977823
2010	5300466
2011	5644022
2012	6010365
2013	6399381
2014	6789357
2015	7023206
2016	7265449
2017	7515345
2018	7774200
2019	8044735
2020	8329798.000000001
2021	8631876
2022	8952496
2023	9292336