Year	% of revenue
2012	0.33883147448562
2013	0.4552785038214811
2014	0.4761591529159636
2015	0.39262936587712693
2016	0.42117076344586213
2017	0.4659613295748607
2018	0.3489760457734332
2019	0.09274089186147902