Here's their table showing a breakdown of taxes by income decile.
Income effects on the top decile are statistically insignificant.
How about the ratio of these expenditures per household plotted against total income, broken down by decile.
Data that are viewed at the decile level may hide considerable variation in households' burdens within deciles.
British Dictionary definitions for decile
one of nine actual or notional values of a variable dividing its distribution into ten groups with equal frequencies: the ninth decile is the value below which 90% of the population lie See also percentile