Year	% of revenue
2009	24.816906697326267
2010	26.358543927573997
2011	30.404488246943156
2012	35.23941994329657
2013	27.947459771563082
2014	35.60667040563049
2015	38.73586364343343
2016	38.249778736947874
2017	38.59017219789444
2018	42.0209627367394
2019	40.67662171178607
2020	40.03883172431733
2021	38.40077910240156
2022	35.75919270537856