Year	% of expense
1995	17.166416791604195
2002	18.153722939912186
2003	19.79734002534297
2004	20.98376132983907
2005	22.69553740792933
2006	20.801306864269044
2007	22.360447486190065
2008	25.72057054848803
2009	25.425850195056633
2010	23.822319196223095
2011	25.600513980701777
2012	24.815414091631364
2013	22.74385443871397
2014	21.60502985605382
2015	21.22436822044321
2016	22.293601801646588
2017	22.40488389810346
2018	21.14711001614235
2019	22.060751153914623
2020	20.590870118970503
2021	21.93151684577166
2022	31.66879057711787