Year	% of expense
1994	1.6045339123394546
1995	3.212596841494976
1996	4.049324746848636
1997	2.405165242728263
1998	2.0266584446078313
1999	1.8020219255675443
2000	2.893190280646665
2001	2.7144307503316654
2002	2.556315732902524
2003	2.478976055515605
2004	2.4042191323029183
2005	1.7987691147723361
2006	1.5948810797041721
2007	1.4680813830261925
2008	1.5907728273415789
2009	3.464710085059469
2010	4.222231892541141
2011	5.004710490749633
2012	5.172231650098869
2013	4.735795633441106
2014	4.541002799337841
2015	4.262201616981294
2016	3.6821776008959737
2017	3.3051486637089442
2018	2.576988499254203
2019	2.2910524543313
2020	1.9105025782549463
2021	1.3251491877849402
2022	1.3021311900408807