Do you remember that New York Times chart? (Yea! I found a way to mention it another time!) On the chart, you can clearly see the boom of the 70s and the boom of the 80s. Each one is followed by a period of price correction which brought back prices to the level before the boom.
I have cut the part showing the boom of the 80s (on the left), and put it next to a much more detailed view (on the right, source: Wikipedia) that shows:
- In blue: how prices evolved in the first half of the 90s, when the bubble of the 80s deflated.
- In red: how prices evolved since mid-2006, when the current bubble started deflating.