Year	% of expense
2000	54.923866824284985
2001	54.190003019406554
2002	54.35566997065971
2003	54.057943526862964
2004	53.21580310503877
2005	54.098778004073324
2006	54.29783950617284
2007	54.69558656051606
2008	55.19505844230992
2009	48.45651018376236
2010	45.72543474921239
2011	44.46495746994098
2012	45.19371402537069
2013	45.49708997511772
2014	45.63315065419537
2015	44.33832545229739
2016	44.59260401284718
2017	33.92117338625831
2018	33.982610698218984
2019	33.813476502495085
2020	52.04379596680154
2021	62.13548748559587
2022	50.56351279931863