The Vanguard Group has issued industry results from its “How America Saves 2011” report, based on the 3.2 401(k) investors it serves in 2,500 plans. The industry that saves the most in 401(k) plans is both small and large utilities (9.0% and 8.2% average contribution rates, compared to an average of 6.8%).

Workers at mining companies have the highest balances (an average of $237,081, compared to an overall average of $79,077), and employees of small ambulatory healthcare companies put the most money into target-date funds (62%, compared to an average of 41% overall).

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