Year	% of expense
2005	2.3971015869965995
2006	2.401705868273896
2007	1.4745308310991958
2008	1.270475097166128
2009	1.9010060865099017
2010	1.4782750395856918
2011	1.8885163571953412
2012	2.1977962002686415
2013	2.6206267016985008
2014	1.8787583435557822
2015	2.4654383862877314
2016	2.003919694723387
2017	1.7393495003008845
2018	1.6336062217001333
2019	1.5504895234663703
2020	2.6919479243337223
2021	2.628303999039703