Year	% of expense
2001	0.36771474345164185
2002	0.6348687275725722
2005	5.733343326088586
2006	6.505706078720596
2007	6.8751703461433635
2008	8.000477640456147
2009	15.634146925674866
2010	15.01260405834345
2011	10.679296150976098
2012	10.756583650244474
2013	10.42731741740453
2014	9.179776632146917
2015	3.255390745591733
2016	5.117900920027975
2017	10.409956365323774
2018	8.338557470530702
2019	7.504857014602943
2020	8.209530692996541
2021	8.821035839513607
2022	5.174651993496469