Your graph shows exactly how the frog gets boiled and never notices.
I don't know much about boiling frogs. I'm not a vivisectionist. Nor a very good cook.

But I will tell you this. If you were to substitute Americans for those frogs you speak of. And if you substituted gasoline prices for the boiling water. You'd probably be right.

yep...that was the analogy I was going for.
That's a weird set of curves - I'd expect to see a yearly, or even an overall bi-yearly, to time with US elections, cycle. Instead, 9 months? The only 9-month cycle I can think of is human gestation and that has nothing to do with gas, humans in the 1st world don't even plan for the seasons these days.