Wealth inequality widened dramatically during the first two years of the economic recovery, as the upper 7 percent of American households saw their average net worth increase 28 percent while the wealth of the other 93 percent declined, according to a report released Tuesday.

The study by the Pew Research Center underscored other data showing that the economic growth that has followed the Great Recession has benefited mainly those at the top. The uneven recovery has only accelerated a decades-long trend of growing wealth inequality in the U.S., despite rising popular and political awareness of the dynamic.

From 2009 to 2011, the average net worth of the nation's 8 million most affluent households jumped from an estimated $2.7 million to $3.2 million, Pew said. For the 111 million households that form the bottom 93 percent, average net worth fell 4 percent, from $140,000 to an estimated $134,000, the report said.