Year	% of expense
1995	14.176355337997762
1996	14.24014932405482
1997	13.379546554632926
1998	12.680404096610465
1999	9.076251710877585
2000	10.05778972883337
2001	11.480714715933315
2002	10.329728423955794
2003	9.217955857016863
2004	9.20678292575631
2005	8.67823392523883
2006	10.837597618831746
2007	9.870813540980423
2008	8.967336805659357
2009	9.793119173378924
2010	9.844270783948565
2011	10.489295764952349
2012	10.23816324641276
2013	9.607876130742255
2014	9.74030660479734
2015	10.157823861710725
2016	9.18982280605301
2017	9.846721735318958
2018	9.348729955073232
2019	8.85303874664585
2020	8.595604590570534
2021	8.68483601006383
2022	9.716913999162808