Year	% of expense
2011	21.355090594712927
2012	22.529229857957414
2013	25.55985829551235
2014	23.849632991111257
2015	21.10202021792115
2016	21.204185126383415
2017	21.911959841717348
2018	21.37165335552144
2019	19.73560913516837
2020	24.951179212538836
2021	28.080819632822617
2022	21.66178349986193