Year	Number
1960	134761
1961	137714
1962	139561
1963	141434
1964	143334
1965	145255
1966	147203
1967	149178
1968	151183
1969	153497
1970	156734
1971	160040
1972	163420
1973	166862
1974	170381
1975	173975
1976	177649
1977	181391
1978	185217
1979	189123
1980	193644
1981	198261
1982	202994
1983	207840
1984	212809
1985	217882
1986	223084
1987	228410
1988	233870
1989	239852
1990	247270
1991	254918
1992	262814
1993	270931
1994	279311
1995	287950
1996	296869
1997	306038
1998	315503
1999	325262
2000	335336
2001	344700
2002	351285
2003	357995
2004	364843
2005	371803
2006	378905
2007	386143
2008	393529
2009	401036
2010	408697
2011	416504
2012	424471
2013	432590
2014	440865
2015	449298
2016	457892
2017	466651
2018	475577
2019	484624
2020	493712
2021	502734
2022	511559
2023	520058.99999999994