Year	% of expense
2010	12.632346737569252
2011	14.015876142114593
2012	11.583556986037513
2013	16.351744086747292
2014	16.845438160650787
2015	13.27557368779702
2016	11.259657668987618
2017	13.553758098801783
2018	16.665450598249535
2019	9.572838284870476
2020	8.657833485883094
2021	9.838841435381958
2022	10.498580540080638