Year	% of expense
2010	49.24711265038037
2011	51.63365339442987
2012	48.307982648619245
2013	50.69460259621954
2014	48.87953259007581
2015	40.698427667535206
2016	41.41461445563468
2017	32.45684225264454
2018	44.07750347704439
2019	43.90699174026141
2020	46.22786515831045
2021	38.19239308993226
2022	28.28911614582969