Year	% of expense
2010	5.4220043249666725
2012	6.230101336357809
2013	6.14895075720793
2014	5.362281250304993
2015	6.492823304773957
2016	7.418696414435145
2017	7.073307545607317
2018	9.063054394845466
2019	7.904858527615163
2020	8.480182723175723
2021	9.79886060915679