Year	% of expense
2011	14.196121177977423
2012	15.051471871801825
2013	15.833164185904803
2014	16.234563552297143
2015	12.501172626552098
2016	21.309592598360684
2017	25.65904337931165
2018	18.720396045029148
2019	19.063418622275982
2020	28.831691317502106
2021	36.70673413639559
2022	35.761457411064846