Year	% of expense
1986	5.5872667398463225
1987	9.437954190046915
1988	7.8605388272583205
1989	7.537385431741438
1990	6.647807637906649
1991	7.371564253849475
1992	8.230516541217249
1993	9.03473044280813
1994	11.637396792708273
1995	12.749220365114406
1996	10.60263120667704
1997	8.649624353595472
1998	8.419715833233834
1999	6.356086692323274
2000	8.343327212082599
2001	8.457437917036643
2002	8.176128193986182
2003	8.969324640475456
2004	9.363404605697214
2005	10.03287210532374
2006	12.798505094945927
2007	9.535541855811893