FRANKFURT (Reuters) – The European Central Bank could raise interest rates back to zero already this year to fight high inflation, Belgian central bank chief Pierre Wunsch said in a magazine interview, joining a growing group of policymakers now openly discussing a rate hike. The ECB has kept rates in negative territory since 2014 and has not raised them in more than a decade, but a surge in inflation is now making an increase in the minus 0.5% deposit rate increasingly topical. “Based on the current outlook, so with positive economic growth, we will raise interest rates to 0 by the end of the…