Year	Number
1960	33000
1961	33000
1962	33000
1963	33000
1964	33000
1965	45366
1966	45366
1967	45366
1968	45366
1969	45366
1970	57593
1971	57593
1972	57593
1973	57593
1974	57593
1975	75500
1976	73900
1977	74800
1978	77700
1979	80700
1980	84837
1981	87867
1982	91200
1983	93937
1984	97245
1985	102657
1986	113028
1987	117371
1988	121650
1989	125136
1990	130472
1991	135559
1992	140031
1993	143597
1994	148330
1995	148675
1996	156807
1997	165390
1998	173673
1999	184973
2000	196336
2001	196528
2002	187999
2003	192552
2004	190478
2005	193852
2006	188575
2007	186668
2008	199503
2009	190165
2010	193614
2011	191118
2012	180004
2013	168023
2014	171535
2015	168149
2016	164566
2017	146213
2018	124975
2019	115992
2020	107032
2021	100482
2022	93048