Year	% of expense
2008	1.519280328752254
2009	2.1963525245249134
2010	2.412495724546802
2011	3.2768183835368716
2012	3.6668931092536257
2013	3.2485984068569924
2014	3.3008722371798767
2015	4.042913451780697
2016	5.174117920763121
2017	4.569505109185091
2018	5.310179267451929
2019	5.177437695113236
2020	4.721098284302233
2021	4.893296417197467
2022	4.097585641507811