Year	% of expense
2010	5.491915638591464
2012	5.456640329012609
2013	4.719162864364274
2014	5.182190261202458
2015	6.023342792650759
2016	6.585428973984973
2017	7.677912114128898
2018	9.063054394845466
2019	8.038446477337894
2020	8.798754545555772
2021	10.22511123696571