Average 401(k) balances ended 2009 at $64,200, rising 28% for the year and 5.7% in the fourth quarter, Fidelity reported Wednesday, citing the activity of its 11 million participants in more than 17,000 defined contribution plans.

The median one-year personal rate of return in 2009 was nearly 27%, on par with the S&P 500’s 26% return. The contribution rate of 8.2% remained flat for the year, but in the fourth quarter, more people increased their deferral rates than decreased them, Fidelity said.

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