Year	% of expense
2009	5.8067137464837915
2010	5.326732429915425
2011	4.4685326404810075
2012	5.067173911961976
2013	4.447871869174403
2014	4.963860828035562
2015	5.995543883886894
2016	7.709051677110263
2017	7.885434605275083
2018	9.424207176075342
2019	8.085825657449721
2020	9.11732636793582
2021	10.493148733286274