Year	% of expense
2010	22.822274806855216
2011	24.182738504795726
2012	22.329060439514695
2013	22.305448583905644
2014	22.9892435153869
2015	31.627967273638852
2016	26.528620799095258
2017	24.030783906201282
2018	24.08647671015292
2019	19.906183531114092
2020	14.471041618113494
2021	20.57798251707931
2022	22.438577799081145