Year	% of expense
2008	12.614726408901598
2009	12.600845320224595
2010	13.318424808969281
2011	12.36842911801823
2012	12.036985329241446
2013	11.827536123155603
2014	12.66838921388976
2015	12.198722561405331
2016	11.39861844821614
2017	12.821697490808045
2018	13.666174794872807
2019	13.223336074327985
2020	12.171202901452634
2021	13.677919605554647
2022	13.43297425997974