Year	Number
1960	16986839
1961	17071386
1962	17188369
1963	17313948
1964	17426513
1965	17514399
1966	17578752
1967	17622835
1968	17656286
1969	17680808
1970	17700008
1971	17716042
1972	17754909
1973	17819093
1974	17886860
1975	17969353
1976	18059350
1977	18149463
1978	18245174
1979	18359472
1980	18488013
1981	18642421
1982	18832831
1983	19035366
1984	19221224
1985	19323959
1986	19368812
1987	19416829
1988	19463854
1989	19516817
1990	19566739
1991	19659482
1992	19717817
1993	19689849
1994	19651324
1995	19587359
1996	19517499
1997	19462775
1998	19407245
1999	19344246
2000	19279209
2001	19217252
2002	19166165
2003	19180940
2004	19231906
2005	19232260
2006	19215761
2007	19287441
2008	19412549
2009	19487760
2010	19543819
2011	19533835
2012	19492128
2013	19621873
2014	19710043
2015	19616337
2016	19518313
2017	19430184
2018	19343107
2019	19075765
2020	18942324
2021	18799832
2022	18677929
2023	18552946