Year	% of expense
1990	2.3336098370254708
1991	1.8282858944124034
1992	1.126507713884993
1993	1.478292855083558
1994	3.0722065200379305
1995	3.6124048619788707
1996	5.738799799283357
1997	4.175285270064793
1998	4.805185875116426
2000	2.560855667568232
2001	2.643484741736199
2002	7.38157074589653
2003	7.258181886470016
2004	12.224640802387473
2005	11.223206989754226
2006	15.508010684726218
2007	34.99489125675084
2008	3.2861837405343617
2009	1.524677774284816
2010	1.6339610697895235
2011	1.2055365381753236
2012	1.2273722515187961
2013	1.4908864309082412
2014	0.9900852418895054
2015	1.4194464158977997
2016	2.820901432297
2017	3.619579900935025
2018	4.292137051950298
2019	3.1349096302012374
2020	3.1983430408861526
2022	2.050109325790857