Year	% of expense
2000	12.98449954300414
2003	13.441040311396662
2004	13.267438356492374
2005	14.67353520592452
2006	14.958715014046561
2007	14.850086908397643
2008	14.762757511638966
2009	12.771643074829672
2010	12.776670616957622
2011	13.031317338206108
2012	15.766365815363248
2013	15.495750620843781
2014	14.184788477448821
2015	13.163352963482708
2016	11.499082293473332
2017	12.29774581251717
2018	11.340214255829569
2019	10.913601832584085
2020	10.741418178568246
2021	12.124717249642945