July 29 (SeeNews) - Croatian oil and gas company INA [ZSE:INA-R-A] said on Thursday it turned a consolidated profit of 534 million kuna ($84.5 million/71.1 million euro) in the first half of 2021, compared to a loss of 965 million kuna a year earlier, as operating revenue surged 31% on the back of rebound in oil and natural gas prices.