Year	% of expense
2009	8.95284566153291
2010	11.106449096413552
2011	9.99223830271714
2012	9.159813141747094
2013	8.734007236514566
2014	17.20950854308578
2015	15.856091558099559
2016	17.947932885715883
2017	21.402982929070312
2018	17.62944496611418
2019	18.469683477540084
2020	17.986431839435944
2021	20.31515033571078
2022	26.347641302375703