Year	Number
1960	229347
1961	234612
1962	240439
1963	246004
1964	250329
1965	252819
1966	253116
1967	251584
1968	249200
1969	247345
1970	247011
1971	248721
1972	252201
1973	256755
1974	261425
1975	265555
1976	268928
1977	271746
1978	274273
1979	276931
1980	279989
1981	283593
1982	287572
1983	291484
1984	294773
1985	297126
1986	298391
1987	298688
1988	298331
1989	297836
1990	297571
1991	297632
1992	297948
1993	298367
1994	298688
1995	298601
1996	297958
1997	296930
1998	295645
1999	294489
2000	293731
2001	294678
2002	295606
2003	296591
2004	297191
2005	297915
2006	298577
2007	299290
2008	300084
2009	300956
2010	301687
2011	302077
2012	302449
2013	302871
2014	303191
2015	303386
2016	303492
2017	303519
2018	303440
2019	303303
2020	302841
2021	301673
2022	300543
2023	299975