Year	% of expense
1990	0.35132545512615776
1991	0.8922147071521083
1992	7.581283463955925
1993	5.928853754940711
1994	1.4339377991342983
1995	2.3932163005010687
1996	2.7472061111897017
1997	3.346667967606596
1998	2.4650218715062575
1999	2.5065829451083657
2000	2.0181388899299177
2001	1.6519673471140413
2002	5.797101916722675
2003	4.322962178642781
2004	4.534970257731143
2005	5.436996855993729
2006	4.8748877070548895
2007	6.546715272383838