In May 2017, they reported that income shares for those in the bottom half stagnated and declined from 1980 to 2014. Their share declined from 20% in 1980 to 12% in 2014, while the top 1% share grew from 12% in 1980 to 20%. The top 1% then made on average 81 times more than the bottom 50%, while in 1981 they made 27 times more. They attributed Inequality growth during the 1970s to the 1990s to wage growth among top earners, and that the widening gap had been due to investment income.