Year	% of revenue
2009	5.215192687074076
2010	5.215192687074076
2011	5.683955190794344
2012	5.865687348200121
2013	5.376385570747569
2014	6.463403919278648
2015	6.306516989826674
2016	8.925337739478547
2017	8.6985375867947
2018	6.737251356529931
2020	14.618398430923286
2021	15.330778772598356
2022	15.564135357428647