Year	% of expense
2004	0.0644906733886272
2005	0.2055446455680175
2008	12.234892159925327
2012	23.401038918317642
2013	12.368533518762138
2014	14.6687430048713
2015	7.560831695828303
2016	6.5760388247981565
2017	7.802646844464245
2018	4.925122133008063
2019	4.209314460570082
2020	15.522704704225127
2021	10.240886091424487
2022	15.407601354364214