Year	% of expense
2003	5.118645039186422
2004	12.717111989410581
2005	8.621153673634153
2006	8.362521891418565
2007	15.962398195196158
2008	5.193282411798685
2009	6.168857533337829
2010	1.6336828061647892
2011	1.7823029553344965
2012	1.2686244716273931
2013	1.2384966694478312
2014	2.1258946219245285
2015	2.2882494150283246
2016	2.469741212104809
2017	0.994890243815004
2018	1.18754432951658
2019	1.1043773982737044
2020	0.3474066386928066
2021	0.29557797109812867
2022	0.47458066011939026