Year	% of expense
2012	2.798296758013944
2013	2.9426352838983774
2014	2.710504276435316
2015	3.1691149892125305
2016	3.3729280180639662
2017	3.1629727149961893
2018	2.97701688425647
2019	2.587733265585606
2020	2.276321201208116
2021	0.879471189827474