Year	Number
1960	0
1965	0
1970	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	1429
1992	1718
1993	1605
1994	1960
1995	2558
1996	3265
1997	4701
1998	6516
1999	10761
2000	16971
2001	24487
2002	34737
2003	38026
2004	41298
2005	42032
2006	49965
2007	52169
2008	54860
2009	56993
2010	59446
2011	58475
2012	58722
2013	57751
2014	58282
2015	53213
2016	54487
2017	56619
2018	56792
2019	54959
2020	59213
2021	59213