That's a great chart, thanks for posting it. It's amazing how flat it is. One question, are the dates shown as the contract delivery dates, or as the trading dates? So for example the firet one, 11/23/1990, is that the price in 1987 for a contract delivering in 1990? Or is it the price in 1990 for a contract delivering in 1993?

It would be great to compare it to then-current oil prices to see how it compares, but I need to know what the dates mean.

Halfin, The dates are the time of trading in the future 5 years forward.
Glad you find the chart interesting.  I first made a chart like this in July of last year, and it led me to really put my money where my mouth is.

The first observation is the settlement price on 11/23/1990 of December 1993 futures.  The last point is yesterday's closing price of Dec. 2011 futures.