Year	% of expense
2012	4.7904788709481805
2013	7.5359837631240545
2014	6.996880620970181
2015	4.572003227183665
2016	7.024838017043546
2017	6.660604870081312
2018	3.3522961733771983
2019	3.0101577956026535
2020	3.8395321885862295
2021	7.824824959726766