Year	% of expense
2009	2.485789627763401
2010	1.1193172084847305
2011	1.784942251916053
2012	1.762612030519425
2013	1.5979153673003612
2014	3.769553700635954
2015	3.2448132267202667
2016	2.469741212104809
2017	2.9087220202262065
2018	3.766152247189582
2019	3.9476368673856688
2020	5.270663671015362
2021	4.369819026214715
2022	6.006180186476512