The German central bank, or Bundesbank, upgraded Friday its growth forecasts for this year and next year, saying activity in Europe's biggest economy was being supported by both domestic and foreign demand.

The Bundesbank said in a statement it was expecting gross domestic product (GDP) to expand by 1.7 percent in 2015, by 1.8 percent in 2016 and 1.5 percent in 2017. Previously, the central bank had been pencilling in growth of 1.0 percent for this year and 1.6 percent for next year.