Year	Percent
1990	0.12589
1991	0.25027
1992	0.43529
1993	0.46364
1994	0.92254
1995	1.83774
1996	3.05481
1997	6.71109
1998	9.87785
1999	20.84598
2000	30.21635
2001	31.65094
2002	48.82
2003	55.9
2004	64.73
2005	68.71
2006	72.16
2007	75.16
2008	78
2009	79
2010	82
2011	81.27
2012	82.35
2013	84.17
2014	86.19
2015	87.5898
2016	89.6471
2017	84.3955