Year	% of revenue
2010	6.616770948755521
2011	7.064829098849825
2012	3.070309627611557
2013	4.3429447556811835
2014	3.8851156605103645
2015	3.8329661977917597
2016	2.818615695881171
2017	3.0134041603156074
2018	5.021804819646126
2019	4.079026817861258
2020	5.017004433056874
2021	3.7102644194833063
2022	4.964239765574159