0% with no seconds left. I started with micro nations in Africa then moved to the Pacific and Caribbean. Didn't have time to get to Europe but if there was more time to think maybe I would have started there.
Starting in Europe was obvious since Vatican is the first to guess because its size is smaller than an average airport terminal :) Carribean was off target - the isles are too remote to be without any strip. African microcountries are still quite big comapring to Liechtenstein or even Carribean isles.
Not me thinking of small island nations in North America like St. Lucia, St Kitts and Nevis, Barbados etc. Then moving to Pacific island nations from Tonga to Samoa etc🫥