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 is meant by "The re-export figures are indicative of markets rather than volumes"?

The re-export statistics could inform you only of the destination countries, but not of its actual volumes, as the figures of the unofficial re-exports are not given there.