Year	Number
1960	3000
1961	3000
1962	3000
1963	3000
1970	2000
1971	3000
1972	3000
1973	3000
1974	3000
1975	3000
1976	1000
1977	6000
1978	6000
1979	6000
1980	6000
1981	6000
1982	6000
1983	10000
1984	10000
1985	11800
1986	13200
1987	15000
1988	10952
1989	18500
1990	19581
1991	29054
1992	29846
1993	38375
1994	44617
1995	47607
1996	48409
1997	47372
1998	45325
1999	43441
2000	47700
2001	50122
2002	50421
2003	46107
2004	44031
2005	43015
2006	43315
2007	34499
2008	36076
2009	37806
2010	40245
2011	40671
2012	42805
2013	46088
2014	47025
2015	50377
2016	59512
2017	59230
2018	57004
2019	53882
2020	49653
2021	46042
2022	75311
2023	103606