Year	% of expense
2002	17.861019100584677
2003	17.1424078005819
2004	11.1336900145932
2005	11.223259444065743
2006	10.23988820743731
2007	9.535541855811893
2008	9.462810032459121
2009	7.650930152312736
2010	7.480572738040231
2011	5.838194550155896
2012	6.5266125417240834
2013	8.79267621895649
2014	7.432080386350806
2015	8.172478172923627
2016	9.225682454420333
2017	9.149938357277593
2018	11.314004108316764
2019	10.519376102409094
2020	9.970574598864788
2021	10.22511123696571