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The KOF barometer, a gauge of the economy's performance in about six months' time, rose more than expected to reach its highest level since November 2012, suggesting the economy will continue to gather steam.
The dollar fell 0.3 percent to a low of 0.90765 francs, its lowest since early February, according to EBS data.
The euro also hit a three-month low against the Swiss currency of 1.2258 francs.