Year	% of expense
2014	41.72852820215391
2015	40.31440979520558
2016	40.122351420987975
2017	41.701034474855824
2018	42.118854359222595
2019	42.665963691795845
2020	41.24598570218058
2021	41.20710343469069
2022	38.0576930428881