Year	% of expense
2003	48.034343032293734
2004	38.93057535102947
2005	40.943751682066925
2006	43.045826036193816
2007	45.999730935207126
2008	43.70544293730063
2009	55.27438936272412
2010	53.00357262416357
2011	50.79001289175504
2012	52.346308679959066
2013	51.90712609131427
2014	48.53891899881552
2015	49.27274960866355
2016	51.23527563329372
2017	45.55468268951083
2018	52.505184198663336
2019	48.23921575303675
2020	48.18781368676508
2021	49.196855744401915
2022	54.34348496089483