Year	% of expense
2012	2.791246215474123
2013	2.0006185601445465
2014	2.9932592877415605
2015	1.1888438034992035
2016	1.4742045096567564
2017	1.3068123617758027
2018	1.793214137339547
2019	1.392075580504792
2020	1.4401350667594366
2021	1.5850185817709832