Shipping is so flush and bust that this alone might explain the different numbers from different sources. Their revenues are not a mystery either since many Greek shippers are public companies. Shipping could be 7% GDP recently, but again, right now business is a bust. It's easy to imagine revenues quadrupling (if not more) in a good economy, and then it becomes a higher % of GDP.

I'd really like to know about the Greek banks and the fact they were started by shipping magnates. What's the relationship between these banks and the shippers who started them. What kind of impact does this have on Greece? It seems to me, should the world economy get going again, the shippers themselves can recapitalize banks in a similar fashion if the old ones collapse, as long as their wealth isn't too closely tied to the banks they created.