This doesn't give me a great feeling for whether they're recapturing losses from the downturn (from which the rich 'suffered' disproportionately due to their heavy involvement in asset markets), or whether that 85% of the gains is in proportion to what they already took home in proportion of total dollars.
It could be they're taking home 95% of the income so capturing 85% of the growth is actually relatively low. I just don't know.