Year	Number
1960	55475143
1961	55009623
1962	54530929
1963	54036643
1964	53529836
1965	53013631
1966	52200695
1967	51383521
1968	50561694
1969	49741704
1970	48939317
1971	48162739
1972	47384351
1973	46607946
1974	45831223
1975	45054966
1976	44336325
1977	43620050
1978	42902521
1979	42367388
1980	42049135
1981	41712214
1982	41358307
1983	40990219
1984	40686607
1985	40391011
1986	40068987
1987	39738044
1988	39385579
1989	39296740
1990	39368740
1991	39489185
1992	39533441
1993	39518242
1994	39512122
1995	39509505
1996	39459487
1997	39400215
1998	39340974
1999	39226849
2000	39068066
2001	38908572
2002	38737259
2003	38515588
2004	38295974
2005	38085588
2006	37896710
2007	37767668
2008	37686839
2009	37635362
2010	37587981
2011	37568019
2012	37578057
2013	37586480
2014	37573797
2015	37534266
2016	37466194
2017	37351991
2018	37173934
2019	36964045
2020	36668590
2021	36282223
2022	35877495
2023	35480468