Year	Number
1965	1500
1966	1500
1967	1500
1968	1500
1969	1500
1970	1900
1971	1900
1972	1900
1973	1900
1974	1900
1975	2400
1976	2400
1977	2400
1981	550
1982	670
1983	1160
1984	1590
1985	2101
1986	2289
1987	2423
1988	3319
1989	3639
1990	4026
1991	4121
1992	4200
1993	4571
1994	4733
1995	5334
1996	6004
1997	7471
1998	8631
1999	9700
2000	10261
2001	10689
2002	11835
2003	12450
2004	13000
2005	13000
2006	20000
2007	32000
2008	45000
2009	58267
2010	51227
2011	31839
2012	27937
2013	31323
2014	23580
2015	17029
2016	13332
2017	8664
2018	9036
2019	6524
2020	5340
2021	5294
2022	5250