Year	% of expense
2010	24.12746103845135
2012	24.385126754290848
2013	26.4871379642191
2014	24.333508995690885
2015	23.094816861814564
2016	22.967893034982083
2017	25.385085004362487
2018	23.441374510568973
2019	22.79510349360754
2020	17.229610422769415