Year	% of expense
2003	10.490047183213946
2004	7.467730397438597
2005	5.299883701611564
2006	7.643152448743903
2007	7.939185276320429
2008	9.801964443287188
2009	8.374941319048288
2010	9.073020772630112
2011	9.434131068764405
2012	8.978909633982955
2013	9.274083429913077
2014	8.713837298340595
2015	9.325192100743557
2016	8.107315980199676
2017	8.895367001124892
2018	8.650624540903047
2019	7.368804945238453
2020	8.348527071194365
2021	7.416299937283412
2022	8.119347718482297