Year	% of expense
1994	0.07460671491650447
1995	0.07431432975991083
1997	1.6994860239584821
1998	2.485510121466268
1999	1.711134385278637
2008	37.8824796392273
2009	34.40679616377002
2010	36.481074067806176
2011	32.82141335633163
2012	39.5723378152506
2013	34.70418648202449
2014	32.29546029579765
2015	29.850668763584842
2016	34.788720395297325
2017	48.80044581500772
2018	32.12087623603535
2019	35.76185579710327
2020	31.122571605973825
2021	0.01936800078989822