Year	Number
1960	38885
1961	38885
1962	38885
1963	38885
1964	38885
1965	57000
1966	57000
1967	57000
1968	57000
1969	57000
1970	79792
1971	79792
1972	79792
1973	79792
1974	79792
1975	128000
1976	137000
1977	151000
1978	169000
1979	191000
1980	239824
1981	305000
1982	335000
1983	366000
1984	416000
1985	440000
1986	455000
1987	466000
1988	478000
1989	489000
1990	496360
1991	502314
1992	513403
1993	567000
1994	686431
1995	958457
1996	1199000
1997	1312585
1998	1477000
1999	1600355
2000	1675246
2001	1816991
2002	2095000
2003	2411000
2004	2658000
2005	2903139
2006	3243000
2007	3452000
2008	3633443
2009	3871114
2010	4069041
2011	4289000
2012	4254047
2013	4428774
2014	3629047
2015	3539665
2016	3464846
2017	2726193
2018	2740000
2019	2843103
2020	2857193
2021	2821171