Year	Percent
1990	0
1996	0.18377
1997	0.47563
1998	2.56528
1999	4.65221
2000	7.28154
2001	8.7809
2002	10.25262
2003	12.18711
2004	13.68909
2005	15.17223
2006	16.7
2007	20.22
2008	21.81
2009	22.51
2010	28.33
2011	34.95
2012	35.42
2013	40.11683
2014	44.80328
2015	50.13932
2016	52.19133