Year	% of revenue
2009	37.07745777369784
2010	37.07745777369784
2011	33.026272078884084
2012	28.716164315623967
2013	31.512057647336277
2014	18.952399045241243
2015	26.218803438988044
2016	11.334402888396198
2017	18.38167246765722
2018	21.55130895416873
2020	16.77401058263882
2021	16.899784820844708
2022	18.12408421735502