Year	% of expense
2007	55.062334246092824
2008	57.31599219814571
2009	57.51559608095388
2010	58.10645753334013
2011	56.83906553946629
2012	55.968481888009904
2013	66.76500725007665
2014	65.32749076312416
2015	65.67514428993515
2016	63.59706515033716
2017	63.730376853889425
2018	63.82326445899742
2019	63.270432434695756
2020	62.92537921589594
2021	61.27048115715601
2022	59.54098716759706