Year	% of expense
1990	1.1972288859493756
1991	0.9912978421798708
1992	0.6604905011037143
1993	0.4605411924323509
1994	0.33986631924776256
1995	0.34761039686975964
1996	0.32484725050916496
1997	0.40607516823747414
1998	1.0945932186131757
2002	7.348714693430766
2003	3.015339912507557
2004	5.669603880523348
2005	6.304410147730695
2006	4.676010744967939
2007	0.5157666727764837
2008	0.5401280053897006
2009	0.8728072628301923
2010	0.7113040441876707
2011	0.7080449963661642
2012	0.6716761423719536
2013	0.5328204332543296
2014	0.5597274464255301
2015	0.4115518717137177
2016	0.27652420139810635
2017	0.30744347484577234
2018	0.44117448349480454