Year	% of expense
2005	27.943567536917108
2006	28.783034843847105
2007	27.539706536646957
2008	27.583293408664396
2009	28.23368220819958
2010	28.216991916993354
2011	29.25608065018262
2012	28.654029519277618
2013	28.77520334742873
2014	26.258552323688704
2015	27.39732493795665
2016	27.244482199586518
2017	26.792729437671692
2018	25.5375843607538
2019	26.966980225781157
2020	25.839304994636798
2021	25.939147948207648
2022	25.980104207193396