Year	Number
1960	133426
1961	140984
1962	148877
1963	157006
1964	165305
1965	173797
1966	182509
1967	191404
1968	213582
1969	253261
1970	298084
1971	344513
1972	392368
1973	441546
1974	491955
1975	543394
1976	614177
1977	706861
1978	805231
1979	908452
1980	1014048
1981	1100180
1982	1167856
1983	1237572
1984	1308331
1985	1379536
1986	1468697
1987	1575909
1988	1683681
1989	1791840
1990	1900151
1991	2008383
1992	2116231
1993	2223284
1994	2329024
1995	2433988
1996	2572735
1997	2746119
1998	2921130
1999	3097563
2000	3275333
2001	3454198
2002	3633655
2003	3813443
2004	3993339
2005	4280993
2006	4898954
2007	5872624
2008	6988685
2009	7992644
2010	8481771
2011	8575205
2012	8664969
2013	8751847
2014	8835951
2015	8916899
2016	8994263
2017	9068296
2018	9140169
2019	9211657
2020	9287289
2021	9365145
2022	9441129
2023	9516871