Year	% of expense
2005	24.96930707656043
2006	23.973071169053217
2007	24.77145351542135
2008	23.123883647719033
2009	23.181956212448306
2010	22.404911748613703
2011	22.085682020082707
2012	22.628342459017794
2013	25.67358694117083
2014	21.61155396255736
2015	22.246781812707304
2016	28.91290085408614
2017	23.938782788249714
2018	29.255495661571008
2019	40.57558147998567
2020	29.506815175207322
2021	24.25085442221858
2022	26.571455489671774