Year	% of expense
2004	6.628970837993936
2005	1.735009772563708
2006	22.380013731052074
2007	26.559872778259084
2008	19.442274802977238
2009	17.555899736431417
2010	30.62217199146898
2011	32.93504236367586
2012	34.06037839608282
2013	27.350362649751226
2014	17.29667007700678
2015	11.364573772342252
2016	13.553438430017941
2017	8.896087109451912
2018	12.272843945602503
2019	8.694094030096897
2020	11.879337659442248
2021	18.44816049370949
2022	29.94333963923762