Conversation so far:
Which type of petroleum is best for the motor vehicle industry
Liquified petroleum, also known as propane, remains as one of the top 3 motor fuels in the world.
For what reasons is liquified petroleum one of the top 3 motor fuels in the world
Propane is naturally occurring and nontoxic to ground soil and water. Propane is a clean-burning fuel that emits less greenhouse gases than coal and other fuels.

Question: What country is the biggest supplier
Self-contained rewrite: What country is the biggest supplier of liquified petroleum