Year	% of expense
2003	5.097595039561441
2004	5.25674339185261
2005	4.235759393441366
2006	4.48866327628088
2007	5.47878210471994
2008	5.637014753233077
2009	5.6942505035213875
2010	5.93691331523687
2011	5.154253104317788
2012	4.741724449308775
2013	4.574674039046274
2014	4.672643249602202
2015	5.984538220097406
2016	5.376408250181619
2017	5.38529989986268
2018	4.788374982949938
2019	4.559523999179753
2020	5.668729188115508
2021	5.488512137500285
2022	7.37929522001425