Year	Number
1960	356902
1961	381483
1962	402612
1963	420226
1964	435239
1965	447749
1966	457747
1967	465896
1968	472579
1969	477565
1970	480492
1971	481661
1972	481294
1973	479462
1974	476514
1975	473096
1976	470679
1977	471243
1978	474726
1979	475667
1980	474509
1981	476095
1982	480176
1983	486412
1984	492842
1985	498398
1986	503464
1987	507596
1988	510023
1989	518400
1990	531431
1991	541275
1992	537942
1993	523419
1994	509699
1995	497243
1996	485936
1997	472983
1998	457367
1999	438797
2000	417930
2001	396864
2002	378158
2003	361443
2004	345149
2005	328313
2006	310649
2007	293927
2008	280911
2009	272534
2010	267135
2011	263360
2012	261678
2013	261888
2014	263705
2015	266214
2016	268553
2017	270451
2018	271394
2019	271444
2020	270863
2021	270747
2022	270620
2023	269347