Year	% of expense
2012	7.603791740461416
2014	7.304560029167933
2015	6.664309360664186
2016	5.757033642759071
2017	4.327078804533065
2018	4.818223152209251
2019	4.211470446056553
2020	6.2324846422394575
2021	6.21144627072076