Year	% of revenue
2008	0.9550515159297082
2009	0.7496717741679606
2010	0.7974171144199177
2011	0.7307636780777645
2012	0.6094043959868402
2013	0.6397647821101369
2014	0.5083591714671247
2015	0.6514667535216148
2016	0.35974333752673654
2017	0.3987488594059486
2018	0.34574644670497817
2019	0.4791839084616824
2020	0.5987930211260439