Year	% of expense
2010	2.405626330152652
2011	2.8993528788803418
2012	3.1509434037899604
2013	3.288599794813712
2014	3.3712222094168354
2015	2.7442448627010103
2016	2.784817775272232
2017	2.486887574005322
2018	2.692344892671311
2019	4.091314829795302
2020	2.454260574295684
2021	3.348655900952182
2022	2.6260554037414376