Year	% of expense
2009	61.524914126643125
2010	61.43608498823164
2011	61.085052856831
2012	58.214022676829394
2013	62.40507874312446
2014	63.479363710306636
2015	64.45167095212418
2016	64.25560838012238
2017	63.588083549791655
2018	64.07113824055185
2019	65.36869254538784
2020	64.91813526706474
2021	62.64446897481003
2022	60.67533502109714