Year	Number
1960	7000
1961	7000
1962	7000
1963	7000
1964	7000
1965	10000
1966	10000
1967	10000
1968	10000
1969	10000
1970	14000
1971	14000
1972	14000
1973	14000
1974	14000
1975	20100
1976	20000
1977	21000
1978	22600
1979	20700
1980	19600
1981	20480
1982	22962
1983	24067
1984	20970
1985	25580
1986	25830
1987	26000
1988	26943
1989	27414.5
1990	27886
1991	28405
1992	30047
1993	20770
1994	30449
1995	38972
1996	47927
1997	54074
1998	56919
1999	57239
2000	61678
2001	56149
2002	54976
2003	60995
2004	71568
2005	87513
2006	108140
2007	165788
2008	168481
2009	233533
2010	327114
2011	464849
2012	314956
2013	272844
2014	324442
2015	328811
2016	368243
2017	262286
2018	82066
2019	85710
2020	90774
2021	105086
2022	116660