Year	Number
1960	186661
1961	197573
1962	208369
1963	219311
1964	230887
1965	243076
1966	255330
1967	267011
1968	277384
1969	286172
1970	294468
1971	303277
1972	312433
1973	321787
1974	331152
1975	340074
1976	348301
1977	355659
1978	362062
1979	367504
1980	372851
1981	378926
1982	385560
1983	392690
1984	400313
1985	408548
1986	417489
1987	426784
1988	435876
1989	443257
1990	448583
1991	452866
1992	455958
1993	457561
1994	457596
1995	456302
1996	454079
1997	450954
1998	446619
1999	441209
2000	433790
2001	424736
2002	415579
2003	406120
2004	396517
2005	387482
2006	380339
2007	376514
2008	376479
2009	380109
2010	385763
2011	392262
2012	400812
2013	412280
2014	426575
2015	443323
2016	462183
2017	482766
2018	504624
2019	526698
2020	544630
2021	557266
2022	566123
2023	570289