The richest Americans got richer during the first two years of the economic recovery, while average net worth declined for the other 93 percent of U.S. households, says a report released yesterday.

The upper 7 percent of households owned 63 percent of the nation's total household wealth in 2011, up from 56 percent in 2009, said the report from the Pew Research Center, which analyzed new Census Bureau data released last month.

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The main reason for the widening wealth gap is that affluent households typically own stocks and other financial holdings that increased in value, while the less wealthy tend to have more of their assets in their homes, which haven't rebounded from the plunge in home values, the report said.

Tuesday's report is the latest to point up financial inequality that has been growing among Americans for decades, a development that helped fuel the Occupy Wall Street protests.

Other details of the report:

Overall, the wealth of American households rose by $5 trillion to $40.2 trillion in 2011 from $35.2 trillion in 2009.

The average net worth of households in the upper 7 percent of the wealth distribution rose by an estimated 28 percent, while that of households in the lower 93 percent dropped by 4 percent.