Year	% of expense
1994	5.691339645176962
1995	5.731164274322169
1996	5.416579233989828
1997	5.7485287968260765
1998	4.1388474722024275
1999	4.893363788320338
2000	5.242687287954275
2001	5.502314452728969
2002	5.139912000861762
2003	5.6749214361114815
2004	5.1237709992155445
2005	5.33040395042506
2006	5.419910935230428
2007	5.999610698637047
2008	5.200994921136116
2009	5.16914863756938
2010	4.784795063702315
2011	4.470941797111476
2012	4.608884157339938
2013	5.172645467785561
2014	5.442179855160364
2015	5.289800798906759
2016	5.470478761703021
2017	4.975321556600772
2018	5.092904140276197
2019	5.685867291202621
2020	4.884043511060278
2021	6.285738659601107
2022	5.979938731987392