Year	% of expense
2009	41.6257820016138
2010	31.714461953792583
2011	32.78755284435005
2012	29.076647723243195
2013	31.08839452059317
2014	31.08577688986966
2015	26.71139305833254
2016	28.342147127584326
2017	19.836009993136962
2018	18.686983984610137
2019	23.478038048754026
2020	23.13859067073769
2021	25.40714350109469
2022	22.70563266676104