Year	% of expense
1995	0.24378776533686247
1997	0.11373534166826212
2002	2.7800724934549663
2003	3.0803163660797184
2004	-0.007195757846355535
2011	5.154253104317788
2012	5.0711973381831985
2013	4.574674039046274
2014	7.857255706763317
2015	9.231116470684565
2016	5.376408250181619
2017	5.201584202524674
2018	4.523263851797372
2019	4.559523999179753
2020	4.646336939762761
2021	5.739117524093421