Year	% of expense
2011	35.283520617460546
2012	34.96650136237988
2013	30.994070838735738
2014	31.95650092067308
2015	33.39298422226318
2016	35.16645440625711
2017	34.664718465045794
2018	37.316920617245174
2019	36.308934777947066
2020	36.4416280844937
2021	35.63092511436657
2022	47.34049462528346