Year	% of expense
2000	10.270901467331003
2001	9.524269705485567
2002	9.550419844952156
2003	10.21683528371332
2004	9.566684252908672
2005	11.395264444348179
2006	12.157161467863808
2007	11.950727577680134
2008	10.852844334739531
2009	10.861439885683298
2010	11.07504145031216
2011	9.297501192724123
2012	9.078784204936111
2013	9.752452699818628
2014	8.972116877247451
2015	8.742444921037238
2016	8.301109535005732
2017	8.825251503699366