Year	% of expense
1995	14.636827923259736
1998	12.551601327469445
1999	13.584503555707471
2000	13.895962126320011
2001	14.478331910319808
2002	13.154476794194451
2003	13.24796454871872
2004	12.06279341331707
2005	14.370160509911411
2006	14.561428555557182
2007	13.88787333363106
2008	12.218913113061767
2009	12.237025520116074
2010	12.356272823766053
2011	10.87714221667739
2012	11.618469328146967
2013	11.55476752101572
2014	12.594434500751962
2015	11.94988514233606
2016	11.386699452428516
2017	12.153046308877103
2018	11.356458168201705
2019	11.549394597719964
2020	11.34857124743791
2021	12.325213030245424
2022	12.397945878718582