Year	Number
1960	181734
1961	181734
1962	181734
1963	181734
1964	181734
1965	415000
1966	415000
1967	415000
1968	415000
1969	415000
1970	887000
1971	887000
1972	887000
1973	887000
1974	887000
1975	1687000
1976	1806000
1977	1904742
1978	2025307
1979	2156046
1980	2270406
1981	2401169
1982	2534413
1983	2714395
1984	2926885
1985	3116798
1986	3291971
1987	3465815
1988	3618065
1989	3788146
1990	3948654
1991	4190087
1992	4496544
1993	4744016
1994	4976205
1995	5162772
1996	5328794
1997	5430855
1998	5535521
1999	5610931
2000	5659274
2001	5607779
2002	6293806
2003	6300432
2004	6352302
2005	6311656
2006	6170455
2007	5469425
2008	5253695
2009	6000361
2010	5898097
2011	5744955
2012	5461193
2013	5392610
2014	5319159
2015	5260560
2016	5200950
2017	5176475
2018	5114735
2019	4806633
2020	4859182
2021	4912074
2022	4907123