Year	Number
1960	18016186
1961	18164949
1962	18436194
1963	18791002
1964	19180281
1965	19505716
1966	19817592
1967	20194041
1968	20576909
1969	20927782
1970	21208613
1971	21473819
1972	21786087
1973	22090640
1974	22366109
1975	22597278
1976	22789948
1977	22946418
1978	23069644
1979	23187013
1980	23345419
1981	23539855
1982	23735300
1983	23930817
1984	24093967
1985	24215120
1986	24332200
1987	24442324
1988	24528173
1989	24630450
1990	24764298
1991	24911597
1992	25071370
1993	25225455
1994	25376674
1995	25522188
1996	25667217
1997	25839020
1998	26047030
1999	26258283
2000	26207082
2001	26397266
2002	26536166
2003	26665100
2004	26785845
2005	26892993
2006	26987088
2007	27072534
2008	27148245
2009	27207210
2010	27149441
2011	27117387
2012	26990755
2013	26811365
2014	26609308
2015	26396251
2016	26160735
2017	25909730
2018	25647760
2019	25389267
2020	25118729
2021	24835510
2022	24410950
2023	24405465