Year	% of expense
2008	5.902310631781802
2009	5.86355856774289
2010	5.424398857770106
2011	4.901414168363683
2012	4.365783974681076
2013	4.040324073618448
2014	4.694074126878343
2015	5.393211842015189
2016	5.012344727146464
2017	4.766504002346314
2018	3.927242893917656
2019	3.992337817514861
2020	6.411847220944569
2021	5.550380260174098
2022	7.37929522001425