Year	% of expense
2003	13.894003926105075
2004	13.11184257735179
2006	14.531898274930866
2007	14.887476464599429
2008	14.573790116974749
2009	14.92497636749262
2010	14.794981750816316
2011	14.533278737375605
2012	15.385440659416538
2013	15.839702104840732
2014	15.683553241838442
2015	15.999444788735385
2016	15.162370336799842
2017	14.288747326809581
2018	14.8673686344248
2019	15.881846441727845
2020	14.675193851919062
2021	15.585599573033953