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Statistics South Africa said headline CPI slowed to 0.2 percent month-on-month from 0.3 percent in November, while the 2011 annual average accelerated to 5.0 percent compared to 4.3 percent in 2010. Economists surveyed by Reuters expected headline year-on-year inflation to quicken to 6.2 percent and remain unchanged at 0.3 percent on a monthly basis.