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	300
1995	1300
1996	2300
1997	4100
1998	12784
1999	35752
2000	63094
2001	147500
2002	163010
2003	283666
2004	333888
2005	510269
2006	1045888
2007	2217612
2008	4835239
2009	6283799
2010	7711721
2011	8680772
2012	8778600
2013	8461120
2014	9713883
2015	10693765
2016	7998253
2017	8730499
2018	10654710
2019	13003000
2020	15869000
2021	16279633
2022	20782900