Year	% of expense
1994	54.962829311386265
1995	49.057621497074464
1996	31.997570189259477
1997	30.615537644860748
1998	28.44863445303322
2008	9.160665006394291
2009	9.612482352368435
2010	9.738816494612736
2011	9.726825922962625
2012	10.806827444813134
2013	12.100304725295485
2014	12.66838921388976
2015	12.198722561405331
2016	11.497456368814351
2017	6.809367606997737
2018	11.43715544147245
2019	7.931938686491066
2020	13.502798432651945
2021	43.7897849369287