With these data, the fuel consumption in each ship class and sub-class was calculated for 2001, including the auxiliary engines. The consumed bunker fuel totaled 281 million tons, of which 191 million tons is heavy fuel oil (HFO), and 90 million tons is diesel oil (MDO) and/or gas oil (MGO).
This total is double the amount of bunker fuel most major international oil companies are willing to accept. There are several possible explanations for this wide gap, one being that part of the cargo carrying ships are in domestic trade and are therefore not part of the "official" international bunker fuel inventory. It is also not quite clear if the fuel consumption by the huge shipping fleet is considered as international bunkers or not.
You can start here. And then track the BDI (SEA the ETF) and crude prices.
they're in lock step.