Year	Percent
1990	0.01287
1991	0.02569
1992	0.07685
1993	0.12769
1994	0.28007
1995	0.3808
1996	1.33185
1997	2.80332
1998	4.36189
1999	7.08504
2000	13.62496
2001	18.14872
2002	20.39
2003	39.93
2004	44.01
2005	47.88
2006	50.37
2007	55.11
2008	59.6
2009	62.4
2010	65.8
2011	67.09
2012	69.81
2013	71.635
2014	76.19
2015	78.6896
2016	80.56133
2017	84.60225