With 1.83 billion metric tons shipped annually (2017), and assuming all ships are loaded full with 120'000 metric tons (post-Panamax limit), there are around 15

With 1.83 billion metric tons shipped annually (2017), and assuming all ships are loaded full with 120'000 metric tons (post-Panamax limit), there are around 15'000 such shipments yearly. Which begs the question, why isn't the impact higher?