Year	% of expense
2005	14.900800471443304
2006	13.92284676212866
2007	11.085477299589245
2008	10.445304803870407
2009	12.771643074829672
2010	12.751575237314949
2011	13.899772642428918
2012	12.127470335667185
2013	9.59668266138151
2014	13.59027889068139
2015	12.464531099992652
2016	12.4405976389563
2017	13.089191004618241
2018	12.542546985831487
2019	10.555527617189595
2020	12.1264447582368
2021	16.68772894091435
2022	14.11511901028146