Year	Number
1960	237590
1961	243908
1962	256013
1963	268035
1964	280009
1965	291916
1966	303804
1967	315676
1968	327573
1969	339504
1970	351513
1971	363605
1972	375755
1973	379491
1974	383371
1975	387512
1976	391829
1977	396239
1978	399416
1979	404358
1980	409127
1981	413108
1982	416035
1983	417715
1984	425254
1985	431938
1986	438482
1987	445028
1988	451399
1989	458181
1990	464802
1991	468530
1992	473391
1993	477687
1994	483053
1995	485844
1996	489444
1997	494198
1998	498006
1999	502932
2000	506439
2001	509128
2002	511325
2003	513680
2004	515544
2005	517242
2006	518278
2007	519269
2008	519756
2009	519754
2010	519604
2011	519046
2012	519081
2013	518955
2014	518495
2015	517780
2016	516999
2017	516592
2018	516267
2019	516091
2020	516027
2021	516348
2022	515236
2023	515350