Year	% of expense
2013	33.12535722991554
2014	33.83732256034688
2015	27.10228354660746
2016	20.38529352452238
2017	22.856370027205887
2018	24.604065319900034
2019	24.962663099626425
2020	20.51775436461066
2021	23.571767073162768
2022	24.59242535129284