Year	% of expense
2002	8.176128193986182
2003	8.192748225635112
2004	7.8219294517637055
2005	6.385952076840727
2006	6.176124508555643
2007	5.884807418680923
2008	5.527432643883141
2009	5.200032134734092
2010	5.326732429915425
2011	5.340470547835579
2012	5.73045353679712
2013	5.756346329556372
2014	5.609958598208289
2015	5.966425544443691
2016	6.827056110216491
2017	6.471137591646642
2018	6.696503294818676
2019	6.182710533967171
2020	5.711211696876437
2021	6.00938844942534
2022	5.551750099462361