Year	Number
1960	27493397
1961	27347642
1962	26835246
1963	26009547
1964	25205548
1965	24663501
1966	24217677
1967	23965568
1968	24009634
1969	24141920
1970	24333092
1971	24862420
1972	25314562
1973	25823134
1974	26288932
1975	26686321
1976	26955002
1977	27118851
1978	27184739
1979	27140621
1980	26978492
1981	26917514
1982	26759546
1983	26371736
1984	25980900
1985	25535938
1986	24980234
1987	24327904
1988	23589549
1989	22813037
1990	22070284
1991	21438200
1992	20887913
1993	20384722
1994	19944347
1995	19562139
1996	19240525
1997	18973055
1998	18722896
1999	18463330
2000	18230489
2001	18057111
2002	17897800
2003	17734692
2004	17568561
2005	17434426
2006	17323931
2007	17233947
2008	17147195
2009	17027903
2010	16905743
2011	16756081
2012	16598820
2013	16443186
2014	16283609
2015	16113192
2016	15941793
2017	15745852
2018	15522442
2019	15287198
2020	15044891
2021	14797709
2022	14542937
2023	14280675