Year	% of expense
2007	15.261675201238745
2008	13.345851504231776
2009	13.40200941883116
2010	13.318424808969281
2011	12.928677334935795
2012	12.455501330335927
2013	8.790598169779852
2014	8.454917342043718
2015	8.973706776526194
2016	9.60270987035972
2017	10.156635736755277
2018	11.04104679174953
2019	11.584849102040897
2020	11.323861442730902
2021	12.510727028267718
2022	12.650792546907539