Ten-year Greek government bond yields tumbled on Wednesday, after Fitch Ratings on late Tuesday said, it upgraded the country’s sovereign credit ratings. Fitch raised Greece’s rating to B-minus from CCC, citing a rebalancing of the economy and progress in eliminating its fiscal and current account deficits that have reduced its risk of a euro zone exit. Ten-year Greek government bond yields fell 89 basis points to 8.47% – their lowest since June 2010.