Year	Number
1960	504822
1961	513741
1962	526066
1963	541438
1964	558522
1965	576942
1966	596817
1967	617765
1968	639838
1969	663036
1970	687134
1971	711430
1972	736651
1973	763951
1974	793251
1975	824185
1976	855530
1977	886456
1978	916949
1979	944274
1980	964464
1981	979617
1982	993140
1983	1005380
1984	1015997
1985	1025362
1986	1033935
1987	1041496
1988	1046126
1989	1075171
1990	1110328
1991	1124442
1992	1097260
1993	1042598
1994	1004486
1995	982458
1996	973602
1997	965014
1998	957925
1999	952956
2000	948431
2001	943958
2002	940469
2003	938570
2004	938208
2005	939265
2006	941586
2007	945080
2008	948299
2009	949119
2010	946934
2011	941988
2012	935240
2013	927052
2014	917695
2015	906853
2016	894562
2017	881678
2018	868875
2019	856299
2020	845681
2021	835611
2022	827146
2023	822557