Year	% of expense
2004	14.315547666283804
2005	2.940695493242268
2006	1.3243104939034074
2007	4.563668063499832
2008	1.2099603270783637
2009	1.5664693423762224
2010	1.3277298423088366
2011	1.1318790572427526
2012	-0.05553060111984159
2013	-0.0927396409821023
2014	-0.3275851412324618
2015	-0.29895366218236175