Year	Percent
1990	0.02327
1991	0.04612
1992	0.0984
1993	0.24995
1994	0.31136
1995	0.81969
1996	1.62424
1997	3.6008
1998	6.78182
1999	23.55219
2000	44.7
2001	56.6
2002	59.4
2003	65.5
2004	72.7
2005	73.5
2006	78.1
2007	78.8
2008	81
2009	81.6
2010	83.7
2011	83.75912
2012	84.07
2013	84.77
2014	87.55683
2015	89.9
2016	92.84303
2017	95.09715