Year	% of expense
2000	2.5368753857587323
2001	1.920062188249012
2002	2.421266094944905
2003	2.3879454391832153
2004	2.302796753663806
2005	2.325839899910506
2006	3.7155300396959987
2007	8.148741307796852
2008	3.3894233869274037
2009	1.6777120319869874
2010	2.0775640469243455
2011	3.836408952443292
2012	1.8994584624382125
2013	2.851741704967742
2014	2.5512593608803855
2015	2.6340841626705114
2016	2.583342964400648
2017	2.5580072864378476
2018	1.729775587379796
2019	0.9974189550343073
2020	0.9861354571913268
2021	1.4322557921243553