Year	% of revenue
2012	-1.0411718498153877
2013	-0.9844293327870431
2014	-0.6703181135482654
2015	-2.136238647390848
2016	-4.483514012597533
2017	-4.5431499923009415
2018	-4.460296766180539
2019	-4.62757593346298
2020	-4.691270714242882
2021	-4.4462804320565095
2022	-4.258868562363373