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	0
1992	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	22
1999	200
2000	300
2001	395
2002	495
2003	526
2004	615
2005	650
2006	700
2007	750
2008	1000
2009	9907
2010	10595
2011	13788
2012	18000
2013	20000
2014	30000
2015	41000
2016	52000
2017	46123
2018	53338
2019	54658
2020	54661
2021	52632
2022	64076