Year	% of expense
1995	22.41092241092241
1996	21.720055827684806
1997	21.69045921548311
1998	22.932791101157886
1999	21.06676960335884
2000	22.406127596126964
2001	23.22200830861138
2002	25.263364000402188
2003	24.270154875743934
2004	23.8342418506436
2005	26.3096649287086
2006	24.163141806704562
2007	24.714074686728537
2008	23.400048736734416
2009	24.604579475221716
2010	22.509722306892485
2011	23.289497532975474
2012	23.665434334851675
2013	21.50495971199323
2014	22.026930822399333
2015	22.980096981646167
2016	21.952284778974942
2017	21.8211314503369
2018	23.215951888593455
2019	23.97524022224864
2020	22.758807414596355
2021	19.55904982429179
2022	21.701093541526202