The biggest improvement in overall sentiment from last year's survey was among Spanish investors, followed by their Chinese and French counterparts. Brazilian investors were the most downbeat compared with a year ago.

The state of the global economy was the biggest single concern for investors (38 percent), followed by government fiscal policy and the euro zone debt crisis (both 32 percent).

The survey covered over 11,500 investors in 23 countries across the Americas, Africa, Asia Pacific and Europe.

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