The energy density steadily increased over time while prices decreased:
This article includes some interesting background info and the following chart.
It should be pointed out that those two changes are very much not equal. Energy density has only increased by a factor of ~5, whereas cost has fallen by a factor of ~90 (by eye).
The energy density steadily increased over time while prices decreased: This article includes some interesting background info and the following chart.
It should be pointed out that those two changes are very much not equal. Energy density has only increased by a factor of ~5, whereas cost has fallen by a factor of ~90 (by eye).