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	2500
1998	6725
1999	12243
2000	51065
2001	152652
2002	254759
2003	435757
2004	708000
2005	1503943
2006	2339317
2007	3079783
2008	4405006
2009	5970781
2010	7224176
2011	7855345
2012	8804986
2013	12401290
2014	18482638
2015	20134932
2016	15025598
2017	11875506
2018	14074248
2019	14773364
2020	15463226
2021	13686234
2022	13870798