Year	% of expense
2011	44.54289103398819
2012	40.6966139243754
2013	39.31528000153605
2014	42.03521988914283
2015	38.56991963370914
2016	35.08467637586896
2017	33.462185852677656
2018	41.17668708943103
2019	38.0937464102495
2020	33.72111162802211
2021	32.30995546815083
2022	32.77196310898004