Year	% of expense
1990	2.677988242978448
1991	2.1453183110916663
1992	2.0783546041592573
1993	2.143947426680497
1994	2.0653068487665913
1995	7.0420065048088825
1996	6.7131463154661395
1997	5.611961712991953
1998	5.990359763269985
1999	5.256685233157499
2000	5.362182378599204
2001	6.005901805512784
2002	4.774198202803108
2003	4.6814474994446815
2004	11.987360761926494
2005	5.697301603943124
2006	5.398332919781628
2007	5.434679298399465
2008	5.563510298250021
2009	7.577429005272807
2010	5.590245180049372
2011	5.668989639372623
2012	6.056938601466535
2013	6.0287517186526465
2014	8.457674816683701
2015	5.157562363125297
2016	5.120386238248862
2017	5.41065374681578
2018	5.20574678923742
2019	5.33153275235469
2020	5.318810814954259
2021	5.2690347625810325
2022	7.688839749988037