With just four months of the year left to go, Germany's central bank, the Bundesbank, upgraded its German economic growth forecast on Thursday to 3 per cent for 2010, reported dpa. The jump, from just under 2 per cent in a June document, was prompted by the sharp upswing in German exports in the second quarter. The Bundesbank issued the new outlook for Germany's gross domestic product (GDP) in its monthly economic report dated August. Bank economists said Germany had now clawed back more than half of the output which it lost through the world economic crisis. They forecast more moderate growth for the second half of his year but said the overall outlook remained favourable.