Year	% of expense
2000	9.562138668830977
2001	10.352501990063407
2002	10.843674369132586
2003	11.2341106976726
2004	11.676088000349209
2005	11.430753564154786
2006	11.535493827160494
2007	11.02283665173254
2008	12.70247656521236
2009	19.491621688873384
2010	22.72326401492126
2011	23.32044930468947
2012	22.33548249962299
2013	21.613314707981697
2014	21.50136968184396
2015	22.655033645111182
2016	21.998870471164857
2017	32.390946373949916
2018	31.825214490059793
2019	32.36020635395821
2020	16.13035916794279
2021	12.796468898703855
2022	17.719998823702248