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	1600
1995	2800
1996	3500
1997	4200
1998	5000
1999	6000
2000	103279
2001	417295
2002	701507
2003	1077000
2004	1530868
2005	2252508
2006	3135946
2007	4536000
2008	6160893
2009	8004120
2010	8636652
2011	10486614
2012	13108058
2013	15664666
2014	17039059
2015	18160667
2016	18717503
2017	19706027