Year	% of expense
1994	17.93508261877599
1995	14.86290771707389
1996	14.003549055962083
1997	14.4834412585195
1998	13.1588023464491
1999	11.818864555645701
2000	12.417561872239204
2001	17.155229499982575
2002	16.919270468602924
2003	18.891978513237717
2004	19.632418379340496
2005	16.716655176822766
2006	13.189213250322268
2007	11.849074533711125
2008	11.91188308544492
2009	10.079287785703684
2010	11.549674295126188
2011	11.903484496616649
2012	11.220890028623092
2013	11.208501292335713
2014	11.266394778738295
2015	11.375776378942698
2016	10.22195411501107
2017	10.382219142477258
2018	10.146334953397043
2019	11.53746086836155
2020	10.919562953505839
2021	9.814584346790419
2022	11.971667725178413