Year	% of expense
2003	14.148214448025048
2004	13.129848367438429
2005	18.185568178226546
2006	15.646702129765414
2007	14.887476464599429
2008	11.996502540380728
2009	16.482701524113793
2010	14.779612193999908
2011	15.830655689460075
2012	6.528303514415512
2013	6.037782712074753
2014	6.150486291572661
2015	4.356163612084227
2016	8.019226334433565
2017	5.4421218913466305
2018	9.440607085206198
2019	9.881759292730113
2020	8.657600307187439
2021	7.474322408390507
2022	5.689010820721556