Year	% of expense
2012	5.0449293819222705
2014	4.963860828035562
2015	5.995543883886894
2016	7.5884500177158625
2017	7.885434605275083
2018	10.582178375769388
2019	8.085825657449721
2020	9.553124927534068
2021	10.493148733286274