Year	% of revenue
2006	2.2958372902865136
2007	0.09511604937517401
2008	0.07509184480652893
2009	0.16621273331490508
2010	0.36195525037049947
2011	0.35490353837792554
2012	0.46239355413408706
2013	0.7533077729600346
2014	0.6949397533850774
2015	0.7573373851289754
2016	0.9208673722933642
2017	0.01770371557493551