The EU Commission currently estimates the wheat yields in the European Union for the 2018 harvest at 6.2 tonnes / hectare. This is evident from the current forecast of the Mars EU Crop Monitor. That would be an increase of 1.4% compared to the previous year.
Further forecasts:
Winter barley yields 2018: 6.05 tonnes / hectare (+ 1.0% compared to 2017)
Winter rape yields 2018: 3.28 tonnes / hectare (+ 0.8% compared to 2017)
Spring barley yields 2018: 4.27 tonnes / hectare (+ 5.2% compared to 2017)