Year	Number
1960	11606
1961	11606
1962	11606
1963	11606
1964	11606
1966	11606
1967	11606
1968	11606
1969	11606
1970	18000
1971	18000
1972	18000
1973	18000
1974	18000
1977	41012
1978	44508
1979	52356
1980	60533
1981	71641
1982	86074
1983	100000
1984	113666
1985	147873
1986	156024
1987	203059
1988	222908
1989	238292
1990	245782
1991	265211
1992	278265
1993	290086
1994	316593
1995	317007
1996	345527
1997	404333
1998	510875
1999	565273
2000	620000
2001	660000
2002	674511
2003	622572
2004	637811
2005	628000
2006	614000
2007	559000
2008	518990
2009	501238
2010	485529
2011	465388
2012	434437
2013	378411
2014	375483
2015	368938
2016	404112
2017	357203
2018	369145
2019	355537
2020	391486
2021	427517
2022	465603