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	44
1996	1071
1997	1370
1998	1633
1999	4162
2000	4967
2001	11000
2002	12600
2003	40000
2004	60000
2005	100000
2006	110000
2007	340000
2008	570000
2009	863641
2010	979232
2011	992444
2012	1143114
2013	1360300
2014	1155620
2015	1242494
2016	1248346
2017	1175389
2018	1279261
2019	1595294
2020	1831000
2021	1831000