Year	% of expense
2009	7.149603634794421
2010	8.284083899216489
2011	9.840143084525653
2012	12.483552635811332
2013	8.161511435368366
2014	7.105856597020466
2015	5.895067782179883
2016	5.796960583958571
2017	4.890975515095327
2018	4.444577815341453
2019	4.98209304645747
2020	5.353868181626935
2021	6.096211009368342
2022	8.556679699496621