Year	% of expense
1990	26.22410492813374
1991	25.725985823268964
1992	25.506840044472373
1993	25.291428880534443
1994	25.254518123740223
1995	26.7948361469712
1996	27.151125203952837
1997	27.387429537342378
1998	30.640258458796193
1999	9.225164910898888
2000	10.592025522347754
2001	9.7988497988498
2002	9.606424010793623
2003	10.035555813908427
2004	9.944589073290668
2005	10.24474400825398
2006	10.475796342129794
2007	11.041414695343194
2008	10.787477868086826
2009	9.928383369126673
2010	9.896962267346886
2011	9.875887053693695
2012	10.135517809672992
2013	9.968404939587328
2014	10.010310824937433
2015	10.054866055510185
2016	10.23128351509814
2017	10.312925228194672
2018	10.258570195609295
2019	10.760583827049084
2020	9.761890465611218
2021	8.99398530263007
2022	10.761485894243672