Year	% of expense
2004	26.657644391196815
2008	19.545577875835875
2009	43.088837723265655
2010	57.90558754844991
2011	48.7644084937603
2012	23.828372597698518
2014	8.202528659210117
2015	16.326394884736104
2016	22.519841238724165
2017	26.572167416914088
2018	24.404807518070793
2019	28.116327429865724
2020	41.50535416055591
2021	31.699308195673503