Year	% of expense
2010	2.2577853050635888
2011	1.3454473835192973
2012	0.8561253617220478
2013	0.629480797897996
2014	0.4296361245067952
2015	0.32971798239902705
2016	0.7104961529067899
2017	1.250474934007712
2018	1.6837870391053926
2019	2.3735601960404633
2020	2.6565063536662485
2021	2.970967171735368
2022	2.9695374689541953