Year	% of expense
2010	27.26322933209034
2012	22.58985555488225
2013	24.89520578014517
2014	20.082233282839212
2015	23.473681140186166
2016	25.056355012460806
2017	19.981561515045
2018	18.82212999522062
2019	23.416284664367105
2020	26.45025392181607