Year	% of expense
2010	18.553888404215225
2011	16.14057321950008
2012	15.388387253353397
2013	20.50082459661717
2014	22.602294315358762
2015	18.280637033347283
2016	21.55444138149382
2017	18.847790712229315
2018	18.960115575142364
2019	18.085210034789064
2020	22.068960414246305
2021	22.20568988726263
2022	25.283422091454145