Year	% of expense
2002	18.291619852001084
2003	17.994444103651645
2004	17.341895340194178
2005	15.9896670260155
2006	9.764740993728667
2007	11.044776665897748
2008	8.829739367495014
2009	8.701547036691318
2010	7.652260962507876
2011	8.303693614886297
2012	7.641753891558767
2013	5.8658178109471
2014	5.856595761551399
2015	6.970763400108283