It makes sense that price growth will slow as we approach the equilibrium exchange rate, at least until the dollar collapses.

good observation

doubling time is gradually increasing, i.e. price is taking too long to double damn it

edit: I should add that this is based on July 4 prices, using Jan 1 or Dec 31 is probably more accurate with calendar year time series


Bell_curve

That graph suggests additional curvature, since the ends are below trend and the middle is above.