Year	% of expense
2010	18.726603145429653
2011	17.320324959125983
2012	17.8318283776153
2016	16.38125332105823
2017	14.774434190938052
2018	13.741020729930945
2019	12.927815893841549
2020	14.678830467108602
2021	14.394375824249778
2022	11.881295484888286