Year	% of expense
2003	1.5759300741288131
2004	1.4800225098480584
2005	3.022163297997855
2007	0.9540925059960906
2008	1.5371085130706523
2009	1.7184201592201482
2010	2.439518819321963
2011	2.064298356726948
2012	1.8685485995305235
2013	1.9308907495586565
2014	2.0019890886045286
2015	1.7621538317746634
2016	1.5511322025133918