Year	Number
1960	223279
1961	233725
1962	244674
1963	256137
1964	268154
1965	280699
1966	293849
1967	307616
1968	322048
1969	337114
1970	352071
1971	366657
1972	381868
1973	397667
1974	414142
1975	431299
1976	449193
1977	467776
1978	487156
1979	504548
1980	519100
1981	534030
1982	549410
1983	565234
1984	581536
1985	598261
1986	615492
1987	633219
1988	651482
1989	659162
1990	654352
1991	649577
1992	644831
1993	640132
1994	635461
1995	630824
1996	626214
1997	621651
1998	617115
1999	612612
2000	608135
2001	603704
2002	599299
2003	594926
2004	590578
2005	584870
2006	578714
2007	572623
2008	566587
2009	560632
2010	554731
2011	548892
2012	543107
2013	537398
2014	531742
2015	526146
2016	520607.99999999994
2017	515129
2018	509707
2019	504342
2020	499034
2021	494425
2022	490632
2023	487707