Year	% of expense
2011	6.22833492304612
2012	7.734775577135198
2013	8.705372738363431
2014	7.513804275003638
2015	9.10100256851055
2016	6.672405493471609
2017	6.035191293023014
2018	8.286980347477915
2019	4.476908527270459
2020	5.105923966450661
2021	5.19311755405216
2022	6.405433326992134