Year	% of expense
2010	59.52182442262289
2011	59.61996591852987
2012	52.94729519296521
2013	52.06518070758178
2014	48.24394758634127
2015	57.52757026419159
2016	58.800741324351634
2017	58.16918340151337
2018	54.27878349753998
2019	56.72418698388908
2020	53.73466057024379
2021	53.782397243032555
2022	50.27445501456901