A Surgutneftegas worker near pumpjacks in Surgut Region of the Khanty-Mansi Autonomous Area - Yugra, in the West Siberian petroleum basin.

The International Energy Agency (IEA) said Wednesday that it expects the coronavirus crisis to erase almost a decade of oil demand growth in 2020, with countries around the world effectively having to shut down in response to the pandemic.

A public health crisis has prompted governments to impose draconian measures on the lives of billions of people. It has created an unprecedented demand shock in energy markets, with mobility brought close to a standstill.

Activity in the transportation sector has fallen dramatically almost everywhere, the IEA said, noting that confinement measures had been implemented in 187 countries and territories in response to the Covid-19 outbreak.

"Even assuming that travel restrictions are eased in the second half of the year, we expect that global oil demand in 2020 will fall by 9.3 million barrels a day versus 2019, erasing almost a decade of growth."

In its closely-watched monthly report, the Paris-based agency said demand in April is estimated to be 29 million barrels per day lower than a year ago, hitting a level last seen in 1995.

For the second quarter of the year, oil demand is expected to be 23.1 million barrels per day below year-ago levels.

Yet, while a recovery is forecast to be underway in the second half of the year, the IEA said it expects this to be gradual and, in December, demand will still be down 2.7 million barrels per day year-on-year.

Oil prices, which were already trading slightly lower Wednesday morning, extended their losses shortly after the report was published.

International benchmark Brent crude traded at around $28.74 a barrel, down more than 2.8%, while U.S. West Texas Intermediate (WTI) stood at $19.77, down around 1.7%.

WTI futures closed more than 10% lower in the previous session, settling marginally above $20 a barrel, while Brent settled almost 7% lower on Tuesday, slightly below $30.