Non-Opec production is expected to record its biggest decline in more than two decades in 2016 as low oil prices bite and drive demand for crude from Opec countries, the world’s leading energy forecaster has said. “Oil’s price collapse is closing down high-cost production from Eagle Ford in Texas to Russia and the North Sea,” said the International Energy Agency in its closely watched monthly report published on Friday. The drop of nearly 500,000 barrels a day next year — taking non-Opec output to 57.7m barrels per day — is the biggest in 24 years. “The Saudi-led Opec strategy to defend market share regardless of price appears to be having the intended effect of driving out costly, ‘inefficient’ production,” the energy authority for wealthy nations said. The lower price environment is forcing the market to “behave as it should” by shutting in production and inducing demand, it added.