PNG has had a major problem with the supply of Avgas for over 12 months already, with no prospects for improvement in the situation any time soon. While the reasons are not specifically based on worldwide supply, Avgas usage has fallen over many years as operators replace piston engined aircraft with turbine engined aircraft, so there is no longer a need to import Avgas in the same quantities as there was in the past.
However, we still have many operators flying pistons and they face an on-going challenge in obtaining fuel around the country every day.