Year	% of expense
2007	5.395659561321524
2008	6.044199552364515
2009	6.361382485199025
2010	6.753874659150294
2011	6.628589714652115
2012	5.353302107097123
2013	4.541484451157546
2014	5.940606212608259
2015	5.825554213807045
2016	5.610134820507643
2017	5.829219405536518
2018	6.7387721149315825
2019	6.424657514684687
2020	6.629120114301232
2021	6.549892590369431
2022	8.119347718482297