Year	% of expense
1995	31.2708424398074
1996	20.3147856375663
1997	23.5079153806646
1998	18.9459763143315
1999	20.0631596188043
2000	22.4831429178855
2001	17.2327213180282
2003	14.2080790469565
2004	4.83000146866512
2005	6.05655098736743
2006	5.63754439578155
2007	6.28971968553713
2008	6.15665448071854
2009	4.19878304060355
2010	6.09648988199186
2011	6.21172295650091
2012	9.68083222565536
2013	10.522113724016
2014	9.22182635065099
2015	12.086233544597