Gas reserves in European UGS facilities in April 42% lower than in previous year / Gas reserves in European storage facilities drop to 34.5% / Gas reserves in European storage facilities drop below 35% / Gas reserves in European UGS facilities drop to 35% / German gas reserves in storage facilities drop below 30% / Gas reserves in European storage facilities drop to 36.5% / Gas reserves in European storage facilities drop to 36.7% / Gas reserves in European storage facilities drop below 38% first time in 36 months / Gas reserves in European storage facilities fall to around 47% / Gas reserves in France's UGS facilities down below 30%