Year	Number
1961	2000
1962	2000
1963	2000
1964	14000
1965	14000
1966	17000
1967	20000
1968	20000
1969	23000
1970	29500
1971	38000
1972	40000
1973	26000
1974	18000
1975	16000
1976	16500
1977	15000
1978	15000
1979	26000
1980	21500
1981	21500
1982	23500
1983	23700
1984	9900
1985	9300
1986	10200
1987	9200
1988	8691
1989	8676
1990	8303
1991	4005
1992	4040
1993	4990
1994	5351
1995	5840
1996	5672
1997	5512
1998	5918
1999	6708
2000	6982
2001	6804
2002	6783
2003	5912
2004	5690
2005	5369
2006	5269
2007	5143
2008	4649
2009	3960
2010	3814
2011	4220
2012	4502
2013	4641
2014	5797
2015	6447
2016	12983
2017	17541
2018	20437
2019	57751
2020	103624
2021	122539
2022	314490
2023	385701