Year	% of revenue
1998	1.1027303059644882
1999	1.0101336236122194
2009	1.1982679490761066
2010	3.990760877427319
2011	2.0748240463897822
2012	0.25035975117398424
2013	0.22470600236072455
2014	0.17490537346006163
2015	0.3466067765386295
2016	0.3708651388497651