Year	% of expense
2010	29.41531251970738
2011	27.853585491554373
2012	28.97922011332783
2016	16.29684010116078
2017	14.809192900000232
2018	16.1240656803912
2019	13.232732977476758
2020	17.316554575312686
2021	17.1803552772459
2022	14.722161446356457