Year	Percent
1990	0
1996	0.00013
1997	0.00398
1998	0.01308
1999	0.12893
2000	0.25425
2001	1.26565
2002	1.855
2003	3.78028
2004	7.64241
2005	12.73993
2006	17.25456
2007	20.75544
2008	23.92
2009	26.55
2010	30.65
2011	35.07
2012	36.8
2013	38.5
2014	41
2015	43.5
2016	46.5