Year	% of expense
2003	12.02168440985613
2004	10.433314575126618
2005	14.136935317858491
2006	14.266448429597677
2007	13.418312758669227
2008	14.694829703080242
2009	14.638050171455932
2010	13.985483818447806
2011	15.268230606253347
2012	14.33235246406355
2013	13.207855154767282
2014	12.109212937091934
2015	13.06599972920697
2016	13.33457674528597