Year	Number
1965	12200
1966	12200
1967	12200
1968	12200
1969	12200
1970	28700
1971	28700
1972	28700
1973	28700
1974	28700
1975	48100
1976	55000
1977	62000
1978	64162
1979	67095
1980	68833
1981	72690
1982	79603
1983	80448
1984	86257
1985	90496
1986	91122
1987	98107
1988	105672
1989	119867
1990	124969
1991	129964
1992	164949
1993	173503
1994	235730
1995	284777
1996	325259
1997	360410
1998	386659
1999	495340
2000	625285
2001	649879
2002	667699
2003	752645
2004	887816
2005	971455
2006	1036777
2007	1080083
2008	1077179
2009	1099128
2010	1000901
2011	1029742
2012	1059000
2013	960535
2014	953773
2015	944266
2016	941184
2017	928433
2018	923029
2019	893630
2020	894000
2021	856090
2022	862717