Working class white men saw their income drop 9% between 1996 and 2014, according to a new report from Sentier Research. This group, who Sentier defines as having only a high school diploma, earned only $36,787, on average, in 2014, down from $40,362 in 1996.

Meanwhile, college educated white men saw their income soar nearly 23% over the same period, from $77,209 to $94,601.

Published by two former Census Bureau officials, the Sentier report shines yet another light on the fortunes of the white working class. This group has become a force in the 2016 presidential election, serving as the backbone of Donald Trump’s support. And the Republican candidate’s campaign has tailored much of his campaign to the working class, with promises that he will bring back the manufacturing jobs that once allowed them to support their families.