Year	% of expense
2002	14.275590202418389
2003	10.746069014056719
2008	7.039283634189053
2009	5.4857413762228
2010	6.703926541432595
2011	5.995710419293726
2012	6.591863323829539
2013	7.034959018970456
2014	7.919117521178438
2015	8.1635434516553
2016	9.90662792164312
2017	11.073029029946843
2018	12.747159985097733
2019	11.111312064109562
2020	10.833687465013243
2021	11.005841648271263
2022	12.2684888687528