The average 401(k) retirement account rose nearly 32%, 31.9%, in 2009, according to a report issued Monday by the Employee Benefit Research Institute and the Investment Company Institute. The average balance among those who consistently contributed to their 401(k) plan reached $109,723 at year-end 2009, up from $61.106 at year-end 2003—for an annual growth rate of 10.5%.

The increases reflect ongoing contributions by workers and employers, investment gains and losses and loan or withdrawal activity. While 401(k)s held by consistent participants rose 31.9% in 2009, the Standard & Poor’s 500 Index rose 26.5% and the Russell 2000 Index rose 27.2%.

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