Year	Number
1960	55000
1961	55000
1962	55000
1963	55000
1964	55000
1965	65000
1966	65000
1967	65000
1968	65000
1969	65000
1970	75000
1971	75000
1972	75000
1973	75000
1974	75000
1975	81672
1976	84681
1977	86228
1978	90675
1979	92987
1980	95615
1981	97039
1982	98732
1983	103052
1984	103840
1985	104637
1986	108098
1987	114235
1988	116058
1989	121355
1990	123665
1991	126086
1992	127072
1993	128069
1994	134812
1995	152473
1996	174985
1997	211672
1998	236530
1999	238956
2000	249400
2001	253738
2002	287854
2003	300921
2004	317000
2005	328000
2006	335561
2007	345000
2008	348000
2009	385116
2010	379000
2011	356000
2012	301650
2013	304162
2014	329475
2015	333702
2016	305720
2017	264150
2018	268849
2019	265734
2020	252067
2021	243421
2022	291324