Year	% of expense
1984	30.237352645768357
1985	30.94047289675868
1986	35.406725216777765
1987	33.349747813889635
1988	39.367846639027675
1994	63.0096915910546
1995	44.44681951387692
1996	38.963954136668846
1997	45.4621690379723
1998	44.85676727885129
1999	47.62709137709138
2000	46.5199396075888
2001	46.99728339402346
2002	46.97789931912044
2003	45.84826007246187
2004	47.01508535580904
2005	45.832986020877975
2006	44.963823087655626
2007	44.2298798795201
2008	43.656113180351426
2009	44.086560066834416
2010	44.21926728346449
2011	43.83826701546652
2012	44.165828474161394
2013	44.804958509046386
2014	45.28752563865375
2015	45.346134707518495
2016	44.51612207583761
2017	43.923391812865496
2018	44.45429058480438
2019	44.597069245995996
2020	47.12252391192138
2021	44.2592560631795
2022	43.191134392350676