Year	Number
1960	6666
1961	6666
1962	6666
1963	6666
1964	6666
1965	10000
1966	10000
1967	10000
1968	10000
1969	10000
1970	13000
1971	13000
1972	13000
1973	13000
1974	13000
1975	18000
1976	19000
1977	20000
1978	25000
1979	30000
1980	36000
1981	36700
1982	49280
1983	45890
1984	46000
1985	47350
1986	48090
1987	62000
1988	65000
1989	67000
1990	70000
1991	72000
1992	48900
1993	53300
1994	53020
1995	52740
1996	52625
1997	62279
1998	65100
1999	67200
2000	64900
2001	76800
2002	80200
2003	85043
2004	94280
2005	96760
2006	98165
2007	94294
2008	114296
2009	303179
2010	281122
2011	159485
2012	208345
2013	214950
2014	287416
2015	284925
2016	304493
2017	161070
2018	171858
2019	124726
2020	119164
2021	120001
2022	93968