Year	% of expense
1995	3.9196544391992187
1997	5.473953453035176
1998	4.053498184211454
1999	4.984870559228958
2002	2.561244902776313
2003	0.6624945262881883
2005	4.998579718594247
2006	9.379080452227383
2007	9.331544488516943
2008	9.489320665634049
2009	12.889024086090895
2010	15.337823950628612
2011	10.642331793042183
2012	4.786431203863195
2013	5.540196120782755
2014	5.80262662160235
2015	6.73877648209643
2016	6.728610777664777
2017	7.217119617915898
2018	6.886861259631997
2019	6.156868229121852
2020	5.088786886816441
2021	6.241864293859475
2022	8.711432551220124