Year	% of expense
2011	18.103669953650332
2012	17.229410542870173
2013	12.982754722084675
2014	12.49131932356311
2015	5.4445087887111585
2016	4.652500664621108
2017	4.20888890671603
2018	6.411586373982625
2019	5.7055742706905495
2020	3.19935419671903
2021	7.8766616867691805
2022	13.264819790314611