Year	% of expense
2000	0.9907814438538948
2001	1.4707082028382026
2002	2.954135739644694
2003	4.202464632139562
2004	7.76898520117997
2005	4.311750698986258
2006	4.231731845472813
2007	5.47878210471994
2008	5.469812934184211
2009	2.1031908255696363
2010	3.516197106179856
2011	3.9318863233781634
2012	3.9893639592509587
2013	2.1634090281975182
2014	1.5624341942349553
2015	0.9151465473888166
2016	1.0928883802156473
2017	1.466127638584086
2018	2.2987406143370253
2019	2.44066634833222
2020	3.2886112084139967
2021	4.132328816899721
2022	1.1692278131994325