Year	% of expense
2002	7.731207650009013
2003	10.341981585461776
2004	9.153733820369728
2005	10.005922572325208
2006	10.999793791274701
2007	9.689007760120669
2008	9.574295473124025
2009	11.12331918408254
2010	11.838204934891436
2011	10.886679475976276
2012	8.969218178132083
2013	8.343936508818373
2014	12.756614985602482
2015	10.808555727164316
2016	13.49780995798695
2017	19.61875868678597
2018	18.09211173505884
2019	20.045694432612045
2020	24.40424791056973
2021	28.89168225830901
2022	40.305987293817175