Year	% of expense
1994	0.5574320595182903
1995	5.51697983106361
1996	4.571788718396238
1997	4.941581079807783
1998	4.864578827343779
1999	4.42942942942943
2000	4.260245265716148
2001	4.1847292064042545
2002	4.093648844737135
2003	3.977267774804536
2004	4.1343691116903045
2005	4.159768087896474
2006	4.07006147660763
2007	4.089559606163933
2008	3.855568228299849
2009	3.7635930623662475
2010	3.774062386097309
2011	3.84450869704897
2012	3.8937265687095115
2013	3.866650795810094
2014	4.099371297868784
2015	4.029009711951269
2016	3.965323635288192
2017	3.865497076023392
2018	3.9944492188050322
2019	4.0164645655304785
2020	3.3280253778783644
2021	3.438365162339607
2022	3.4317902535721654