http://www.eia.doe.gov/emeu/cabs/topworldtables1_2.htm

I assume it has to be related to industrial consumption. The above link has production, consumption and net export/net import data for most countries for a four year period. Click on Source at the bottom of the EIA page.

Rotterdam apparently has a lot of refineries. Could it be that crude oil entering Rotterdam is counted as Dutch consumption, and the finished products are not subtracted from that figure at a later phase? (Just speculation..)

Edit: by finished products, I'm talking about refined petroleum products leaving for nearby countries, not consumed in Holland.