Year	% of expense
2002	44.011855829472005
2003	43.21185740737974
2004	42.05558079248725
2005	39.41479665598089
2006	38.86498321906517
2007	36.2691165159145
2008	36.72020681222427
2009	39.799578229082854
2010	38.168039032829796
2011	38.04707050458455
2012	39.08819462353932
2014	45.02035438080965