Year	Number
1960	493941
1961	495124
1962	497681
1963	501733
1964	505863
1965	508929
1966	510697
1967	510290
1968	508172
1969	505563
1970	502966
1971	500865
1972	500649
1973	501922
1974	503383
1975	504138
1976	504760
1977	504909
1978	504070
1979	502901
1980	501258
1981	499126
1982	497359
1983	495948
1984	494486
1985	492311
1986	489076
1987	485466
1988	482066
1989	478450
1990	474932
1991	470970
1992	466448
1993	463032
1994	460144
1995	457360
1996	456375
1997	455366
1998	453147
1999	450583
2000	446760
2001	442124
2002	436344
2003	429335
2004	421025
2005	411066
2006	399596
2007	387624
2008	376030
2009	365393
2010	354826
2011	341418
2012	327856
2013	314089
2014	298350
2015	282159
2016	265779
2017	248704
2018	229650
2019	222720
2020	223447
2021	217526
2022	211269
2023	208243