That is exactly what I thought - it seems to follow the exponential decay. A quick and dirty graph with logarithmic scale on price: https://imgur.com/a/90a4p ht

That is exactly what I thought - it seems to follow the exponential decay. A quick and dirty graph with logarithmic scale on price: https://imgur.com/a/90a4p https://imgur.com/a/90a4p Pretty much a straight line, except for the Thailand hiccup.