Year	% of expense
2014	14.731247018006513
2015	14.513825350440893
2016	13.868591032842922
2017	14.765207140470585
2018	16.265105159308813
2019	12.870526612624813
2020	11.371515221594654
2021	13.495939455667274
2022	11.740241951827505