Year	% of revenue
2013	39.99285456070829
2014	35.80289030099117
2015	29.75507018672947
2016	34.340174179261915
2017	31.594718725396227
2018	36.58348583680055
2019	36.947325011781054
2020	32.74899590134682
2021	40.39426471463655
2022	41.676332105769006