Year	% of revenue
2009	39.17988733511646
2010	37.198327989406025
2011	28.879651563326668
2012	20.929453655817927
2013	39.720434239826645
2014	20.468120087253446
2015	20.383622631210184
2016	21.048591737050977
2017	20.45796328990807
2018	12.545200808609128
2019	12.88489661832464
2020	15.42086770144033
2021	17.7868888369193
2022	23.977124488561625