Year	% of expense
2007	1.4214912154823558
2008	1.175558403009448
2009	0.9207796889879012
2010	0.9863960346253382
2011	1.3421127519857703
2012	1.5864132151444874
2013	3.238923261407589
2014	4.644227241965025
2015	3.578694718450026
2016	4.726543218185174
2017	4.331423802167953
2018	3.2657197344183597
2019	3.172547425058212
2020	5.849421294269758
2021	5.361642996254775
2022	7.066203443767945