Year	% of expense
2003	10.490047183213946
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