year,highest_quintile_share_pct,lowest_quintile_share_pct,top_two_quintiles_share_pct,highest_lowest_mean_ratio,highest_quintile_reading_vs_all_expenditure_share_pp
2014,39.0,9.2,60.6,4.1875,0.0
2015,36.9,6.4,60.5,5.675675675675675,-2.700000000000003
2016,38.8,10.9,58.199999999999996,3.578125,-0.30000000000000426
2017,37.8,8.8,61.4,4.333333333333333,-1.1000000000000014
2018,31.7,12.6,53.2,2.514705882352941,-7.199999999999999
2019,33.4,13.2,53.7,2.5081967213114753,-5.300000000000004
2020,35.8,12.0,55.5,3.0,-1.5
2021,38.6,10.3,62.6,3.7288135593220337,0.10000000000000142
2022,37.4,12.1,58.8,3.0704225352112675,-1.2000000000000028
2023,35.5,11.0,61.7,3.2,-3.3999999999999986
2024,48.1,7.5,67.5,6.382978723404255,9.700000000000003
2025,43.4,5.9,64.3,7.515151515151516,4.600000000000001