Year	Number
1960	338450
1961	338450
1962	338450
1963	338450
1964	338450
1965	494946
1966	494946
1967	494946
1968	494946
1969	494946
1970	858796
1971	858796
1972	858796
1973	858796
1974	858796
1975	1644499
1976	1849373
1977	2079483
1978	2314593
1979	2556918
1980	2699732
1981	2943882
1982	3116239
1983	3314409
1984	3499957
1985	3704432
1986	3899168
1987	4122681
1988	4387436
1989	4847166
1990	5354500
1991	6024800
1992	6753652
1993	7620880
1994	8492521
1995	8801030
1996	8826148
1997	9253715
1998	9926879
1999	10927385
2000	12331676
2001	13774146
2002	14975085
2003	16330066
2004	18073238
2005	19512024
2006	19861299
2007	19997903
2008	20491430
2009	19505573
2010	19918643
2011	19996800
2012	20587800
2013	18593529
2014	18559692
2015	20170913
2016	20820073
2017	20752662
2018	21647073
2019	22678193
2020	24500456
2021	25615769
2022	27184669