Year	% of expense
2009	57.88898904519728
2010	57.88898904519728
2011	50.59120758899209
2012	49.22963640577662
2013	53.167358720578875
2014	52.658726488496534
2015	50.97992660258822
2016	50.72867448941085
2017	58.07462836199235
2018	53.95937239483677
2020	58.294979283218375
2021	57.94838429873551
2022	60.75719358293982