Year	Percent
1990	0
1999	0.03279
2000	0.0486
2001	0.05126
2002	0.05546
2003	0.06458
2004	0.07748
2005	0.29869
2006	3.77241
2007	7.19762
2008	8.78
2009	10.07
2010	11.55
2011	13.03
2012	14.51
2013	16
2014	17.49
2015	18.98
2016	20.47