Year	Number
1965	500
1966	500
1967	500
1968	500
1969	500
1970	1890
1971	1890
1972	1890
1973	1890
1974	1890
1975	3857
1976	4174
1977	4713
1978	5543
1979	6329
1980	7026
1981	8944
1982	10385
1983	12000
1984	13000
1985	14000
1986	15588
1987	16885
1988	17911
1989	19427
1990	21502
1991	23416
1992	25302
1993	26760
1994	28362
1995	29795
1996	30964
1997	31980
1998	32946
1999	33607
2000	34215
2001	34505
2002	34922
2003	35171
2004	35040
2005	35444
2006	36507
2007	37153
2008	37375
2009	37882
2010	38171
2011	38401
2012	38320
2013	38572
2014	38237
2015	38850
2016	38694
2017	38411
2018	39375
2019	39657
2020	48611
2021	49769
2022	50871