Passage2
What the statistics do not reveal is how much is unofficially re-exported from the country. This is acknowledged by Dubai's customs department. "The re-export figures are indicative of markets rather than volumes, "a spokesman say

Passage2
What the statistics do not reveal is how much is unofficially re-exported from the country. This is acknowledged by Dubai's customs department. "The re-export figures are indicative of markets rather than volumes, "a spokesman says. "If you add up the import figures and work out that 85 per cent of it is supposed to stay in the country then the UAE would be the best stocked warehouse in the world.

What does "stay" mean and imply in "... 85 per cent of it is supposed to stay in the country..."?

To be kept for re-export.