Year	% of expense
2004	25.724903090141567
2005	29.913021710563083
2006	30.80838991242872
2007	29.884329072824045
2008	36.82065052866593
2009	34.31710428602069
2010	31.580021663886647
2011	36.05837996977788
2012	39.86635961266954
2014	32.31466375445256