The dollar index, which tracks the greenback versus a basket of six currencies, rose 0.486% to 94.32. The dollar rebounded on Thursday from a dip on Wednesday as speculators consolidated long positions following five months of steady gains. Poland's central bank surprised with an aggressive hike on Wednesday and the Czech Republic on Thursday raised its main interest rate by 125 basis points, heightening a mass trend of rate rises in emerging markets this year. The Canadian and Australian central banks have caused turmoil in their bond markets in recent weeks by abruptly changing tack on policy.