Year	Total
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	1000
1998	3390
1999	5000
2000	70000
2001	150000
2002	221800
2003	330000
2004	383653
2005	558192
2006	917499
2007	1287631
2008	1807000
2009	2948304
2010	3718748
2011	3884757
2012	4283134
2013	4659762
2014	4930100
2015	5216000
2016	5424000
2017	5056000