Year	% of expense
2014	2.9420476618627167
2015	3.4935369140736583
2016	3.980226221223421
2017	3.336584973457008
2018	4.015109707602598
2019	3.7167029714455326
2020	3.750544628604583
2021	2.981700951780248
2022	3.1939055336337208