Year	% of expense
1992	1.3397642015005375
1993	0.8789598974546804
1994	2.9407586304872875
2002	4.129897846321931
2003	4.109159053642539
2004	4.143179280778391
2005	4.059596859127063
2006	4.144634154903148
2007	4.258760702162225
2008	4.126325898691833
2009	4.10500782982553
2010	4.224211740524831
2011	4.18929336776349
2012	4.635025287988751
2013	3.714364900620093
2014	4.332033048002824
2015	4.459298488434403
2016	4.490302783212894
2017	4.548885966646326
2018	4.52861594452493
2019	4.464688469879869
2020	4.041709940959243
2021	4.185863484155865
2022	4.817087594182472