See this chart from the US Energy Information Administration:
What strikes me in looking at this chart is how much more volatile the residential price has been. Utility companies providing natural gas to residential customers ought to be able to negotiate the same types of long term contracts as the other three categories of users.
I think I might find time to look at what my local public service commission has been allowing the gas company to do. Based on this information and the chart in my previous post, my gas bill ought to be going down.