Year	Number
1960	400
1961	400
1962	400
1963	400
1964	400
1965	1200
1966	1200
1967	1200
1968	1200
1969	1200
1970	1300
1971	1300
1972	1300
1973	1300
1974	1300
1975	1917
1976	1950
1977	2019
1978	2590
1979	3085
1980	3446
1981	4470
1982	4870
1983	5200
1984	5407
1985	7358
1986	8931
1987	10295
1988	11456
1989	12228
1990	12357
1991	12275
1992	11380
1993	14621
1994	15712
1995	17792
1996	15975
1997	20400
1998	21000
1999	21600
2000	22200
2001	21382
2002	28603
2003	35101
2004	37230
2005	47964
2006	53136
2007	47582
2008	41190
2009	40000
2010	38612
2011	38579
2012	50769
2013	50345
2014	49714
2015	40570
2016	41158
2017	10637
2018	8328
2019	12949
2020	11574
2021	9559
2022	6744