Year	% of expense
2011	2.0479740780245
2012	3.568712047325008
2013	4.460315525978561
2014	6.108381584717072
2015	3.3121123323748183
2016	4.956635042847575
2017	6.5165302489697225
2018	5.7075386641099835
2019	4.874060219201979
2020	2.7007354865144353
2021	3.974616174488812
2022	3.820539646679766