Year	Number
1960	21386083
1961	22203076
1962	22912921
1963	23531323
1964	24013031
1965	24383943
1966	24787915
1967	25236621
1968	25611240
1969	25872156
1970	26047057
1971	26186509
1972	26321053
1973	26451660
1974	26563338
1975	26642452
1976	26733894
1977	26863637
1978	26987375
1979	27141774
1980	27365007
1981	27632344
1982	27940650
1983	28258207
1984	28613646
1985	29024474
1986	29441363
1987	29848217
1988	30222827
1989	30489791
1990	30715792
1991	30877535
1992	30984189
1993	31019501
1994	30924739
1995	30732041
1996	30527185
1997	30249227
1998	29857782
1999	29376940
2000	28894763
2001	28384761
2002	27855239
2003	27346464
2004	26888608
2005	26485749
2006	26151905
2007	25873232
2008	25772102
2009	25762685
2010	25838268
2011	25948095
2012	26059662
2013	26252211
2014	26511111
2015	26824273
2016	27148240
2017	27474107
2018	27818878
2019	28150054
2020	28405113
2021	28634327
2022	28440118
2023	28412244