Year	% of expense
2005	48.416245150518094
2006	49.555460568497544
2007	51.52732007608809
2008	54.51504852516997
2009	52.7650262263524
2010	55.02924421490663
2011	53.19994581204757
2012	55.754382234587204
2013	59.19331467973553
2014	59.38174114041712
2015	58.02521220521532
2016	51.353146753567756
2017	53.568288657426876
2018	49.670895878839474
2019	41.21746566292871
2020	47.903382804337454
2021	47.859395863976076
2022	47.45340165719449