Year	% of expense
2009	5.8067137464837915
2010	5.238624683702612
2011	3.868901346368153
2012	5.067173911961976
2013	4.463696557353108
2014	4.778711841088324
2015	6.538605977299825
2016	7.819554707451614
2017	7.510394311774306
2018	9.693393338133875
2019	7.964362305424279
2020	7.661331411867749
2021	8.761468688399106
2022	9.953266811229824