Year	% of expense
2003	19.591633604916844
2004	14.31029325068573
2006	13.89375364856976
2007	13.947840237604908
2008	15.93529590295307
2009	13.65774033584878
2010	10.586850927247587
2011	9.84094874361243
2012	7.1711831987665935
2013	5.5960319518613035
2014	8.393614717612206
2015	6.728883696188051
2016	6.089765914230541
2017	6.669271817774224
2018	7.988321676789317
2019	6.681258084614837
2020	5.914849615836856
2021	5.875513362714902
2022	7.064159621388187