Year	% of expense
2006	5.6873200194654885
2007	5.075315877782468
2008	7.397757238572475
2009	4.466008790209115
2010	1.824990005228814
2011	2.0616613974832476
2012	2.692565767983817
2013	2.884728725819675
2014	3.8818720732792356
2015	4.5479595285057215
2016	8.401295421609758
2017	10.497826420080102