Year	% of expense
2002	7.348714693430766
2003	9.172780424542205
2004	8.632371025988546
2005	8.209938974045295
2006	6.674298383824931
2007	5.4254376882293815
2008	5.735164159464276
2009	5.8656956885573335
2010	0.7422202909690615
2011	0.8564238050244942
2012	0.8205298584742837
2013	1.200443441663694
2014	1.0991284502115988
2015	0.5669557442929954
2016	2.6222429330266483
2017	0.6383127774592264
2018	1.932307120317038
2019	3.2849764924881777
2020	3.568940156383061
2021	6.766550484228609