In 1940, oil production was at more than six million barrels.

Current oil production is estimated at 750,000 barrels a day.

World production in 1997 was estimated at 1000 barrels a day.

It now stands at six million barrels a day, 43 percent of the oil we use.

Four years ago that share stood at three million barrels a day.

A recent estimate places the figure at 18 billion barrels.

A decade ago, they were at 3.5 million barrels a day.

Now, it is at about 2 million barrels a day.

The most recent estimate places the figure at 18 billion barrels.

Peak production from the field was in 1951 at 4.5 million barrels of oil.