Bonga produced 763 million barrels of oil in 12 years

Let's break it down:

763 million barrels of oil in 12 years

To find the average annual production, we can divide the total number of barrels by the number of years:

763,000,000 barrels ÷ 12 years = 63,583,333 barrels per year

So, Bonga produced approximately 63.6 million barrels of oil per year over the 12-year period.