Year	Number
1968	1200
1969	1200
1979	500
1980	500
1981	505
1982	505
1983	526
1984	529
1985	2599
1986	534
1987	20
1988	881
1989	397
1990	2148
1991	3037
1992	4408
1993	5412
1994	7087
1995	7995
1996	8611
1997	8653
1998	8132
1999	6693
2000	5868
2001	4861
2002	18908
2003	20816
2004	21430
2005	16395
2006	12327
2007	13684
2008	15206
2009	17915
2010	18451
2011	19931
2012	729011
2013	2468323
2014	3887490
2015	4873236
2016	5524511
2017	6310498
2018	6654374
2019	6615249
2020	6702910
2021	6848865
2022	6559736
2023	6355788