Natural Gas Stocks Injection in Croatia increased to 31.97 GWh/d on Friday August 21 from 28.90 in the previous day. Natural Gas Stocks Injection in Croatia averaged 11.17 GWh/d from 2014 until 2026, reaching an all time high of 44.26 GWh/d in June of 2017 and a record low of 0.00 GWh/d in April of 2014.