Year	% of expense
2008	53.785742759069045
2009	54.255546432485815
2010	58.10645753334013
2011	53.65884988333312
2012	52.44169114954917
2013	51.78005396858518
2014	50.12913291309017
2015	49.106626953214914
2016	55.080493178058774
2017	49.945399821160976
2018	53.9309505098756
2019	53.152323772498335
2020	54.836813057698095
2021	52.779731535975
2022	46.514660620622735