Year	% of expense
1995	7.011148199962888
1996	6.820305896885769
1997	6.863603464197469
1998	6.81409754553909
1999	6.919720652814855
2000	6.862222189693676
2001	6.857016779724039
2002	7.043977285069551
2003	6.84171647079272
2004	6.708040867869726
2005	6.356446471678737
2006	6.725125596540953
2007	6.623610932554843
2008	6.5437177473485475
2009	6.460594359339399
2010	6.326628748936051
2011	6.1207167053902385
2012	5.935083612983277
2013	5.992207938826004
2014	6.299170642798522
2015	6.402935060799007
2016	6.319199882515774
2017	6.34268743873793
2018	6.200181443209093
2019	6.10137031114273
2020	5.750677054340681
2021	5.743038022401823
2022	5.884497008524976