Year	% of expense
1995	2.981262600885268
1996	3.070956049671683
1997	3.4380412808545784
1998	3.408839078602178
1999	3.2396775487981553
2000	3.140275392774595
2001	2.7754361506404055
2002	2.693049093530863
2003	3.7068977043306273
2004	2.271984025845995
2005	8.50423303710224
2006	3.385632710332056
2007	3.1763835783446464
2008	2.80156608948967
2009	2.9637358244030305
2010	3.266249575842518
2011	3.9852753545475625
2012	5.429288514142287
2013	3.938003316460413
2014	3.6500396056790527
2015	3.0583550458906092
2016	2.5381015750938025
2017	2.5109927281254807
2018	2.3586527433068927
2019	2.382098031213255
2020	2.5798943879196568
2021	2.5095520064820462
2022	3.1706721123691404