Year	% of expense
2005	5.751416383939232
2006	3.9930794617505274
2007	6.844679465045661
2008	7.157397436175055
2009	2.5666858962805
2010	5.326512216248093
2011	6.292470022743335
2012	4.282595119229147
2013	2.9541829877094927
2014	3.5232767668522436
2015	3.1660406242148884
2016	3.4809174681775406
2017	2.945409438190183
2018	4.2956160893826825
2019	8.011429505676187
2020	2.7202381750784888