Year	% of expense
1995	8.946149392009264
1996	12.457363191457809
1997	12.914160743575726
1998	13.557546840451531
1999	11.841424283200496
2000	8.428446005267778
2001	9.087516327673073
2002	9.746758332608128
2003	10.53095219027789
2004	12.006595898175823
2005	13.319882902128333
2006	13.975732062155638
2007	13.590505787506194
2008	16.207245425016417
2009	16.71875
2010	17.901223445467483
2011	16.765188018478963
2012	15.497533744868122
2013	20.408732649787265
2014	19.202210741319238
2015	22.487062882233026
2016	21.50550970758002
2017	19.76622721705929
2018	16.524494498959264
2019	15.32810565414775
2020	13.483760636419657
2021	12.70188140148672
2022	12.588132337481492