Year	% of expense
1995	6.079651090087066
1996	5.263233656302244
1997	5.005586864382668
1998	5.407580388244317
1999	5.256685233157499
2000	5.062513313779147
2001	5.456972717200817
2002	4.831446909707981
2003	5.472503887382377
2004	5.545033041398383
2005	5.534829986948326
2006	5.601611627057157
2007	5.487627804377082
2008	5.576866008118577
2009	5.714379449395759
2010	5.590245180049372
2011	5.54838846033663
2012	5.66340426061111
2013	5.501067214896486
2014	5.567414777681212
2015	5.809766909320064
2016	5.472320398068302
2017	5.414004557382294
2018	5.800158246640988
2019	5.6285807975331075
2020	5.318810814954259
2021	5.5620930942519635
2022	7.440589419955483