Year	Number
1960	353741
1961	359362
1962	364929
1963	370590
1964	376182
1965	381212
1966	385612
1967	389314
1968	392259
1969	394334
1970	395475
1971	396333
1972	397325
1973	398365
1974	399944
1975	402253
1976	405069
1977	407574
1978	409119
1979	409909
1980	409889
1981	409531
1982	409439
1983	409500
1984	409630
1985	410149
1986	410606
1987	410307
1988	409981
1989	409597
1990	408082
1991	406032
1992	404540
1993	403643
1994	403615
1995	404773
1996	406364
1997	407855
1998	409001
1999	409557
2000	409291
2001	408127
2002	406788
2003	404758
2004	401676
2005	398819
2006	396077
2007	392953
2008	389708
2009	386142
2010	382250
2011	378465
2012	374992
2013	372076
2014	369710
2015	367991
2016	366491
2017	363781
2018	359566
2019	354180
2020	347783
2021	341239
2022	335015
2023	328929