Year	% of expense
2002	6.664081987344996
2003	4.668685437754604
2008	6.30255012784499
2009	7.515403116866001
2010	7.65577368360694
2011	9.249087191099726
2012	8.701763874503161
2013	8.579817348053432
2014	8.16244349318352
2015	7.328588052964488
2016	7.972318400976366
2017	7.911460680877788
2018	8.44198352856123
2019	8.388807857167556
2020	8.212896817336143
2021	11.255215742950123
2022	9.424359928855454