Year	% of expense
2010	35.736253728928254
2012	36.02691621081544
2014	36.54633983686144
2015	36.40675007283936
2016	35.870891535758126
2017	37.41773759464635
2018	35.77716912563376
2019	35.872438497052
2020	36.000985586672925
2021	33.76093403370673