FPI inflows, which were negative in the previous three months, have sharply turned positive in December, says V.K. Vijayakumar, Chief Investment Strategist at Geojit Financial Services.Total FPI inflows in December through 22nd is Rs 57,313 crore including the buying through stock exchanges and primary market.The steady decline in the US bond yields have caused this sudden change in the strategy of FPIs, he said.