Year	% of expense
2002	2.200035189878025
2003	1.0495619512963954
2009	2.211092921266265
2010	4.961805453647323
2011	4.797955018125402
2012	5.866612778354465
2013	6.7478124227774146
2014	7.58325057597612
2015	6.639185918089441
2016	7.6244246987892375
2017	4.227256339568808
2018	1.4695499838961972
2019	1.2031531215562659
2020	5.50725785424763
2021	7.44623139833686
2022	3.3880312185767343