Year	Number
1960	562437
1961	555145
1962	549428
1963	547288
1964	548770
1965	551876
1966	556947
1967	561848
1968	562774
1969	561640
1970	561451
1971	561573
1972	562081
1973	562746
1974	562207
1975	560267
1976	556489
1977	550775
1978	542954
1979	533290
1980	521459
1981	506516
1982	491436
1983	479225
1984	469405
1985	461248
1986	453266
1987	444667
1988	437071
1989	431612
1990	427733
1991	426347
1992	428434
1993	432129
1994	436874
1995	443845
1996	451861
1997	459558
1998	466999
1999	474010
2000	480364
2001	485676
2002	489608
2003	492168
2004	493367
2005	493489
2006	493281
2007	492711
2008	491993
2009	490161
2010	487118
2011	483663
2012	479493
2013	475272
2014	471575
2015	469060
2016	467883
2017	467262
2018	466185
2019	464197
2020	461897
2021	460764
2022	461310
2023	461520