We are probably someplace in the peak right now, it will move up and down a bit for a while before going into a real decline. We had a little decline over the last couple of years because oil prices where so low that the oil producers cut back. Now that oil prices are back up, a bunch of stuff they had on the back burner is jumping up and that will increase production for a while.
If I could guess how long, I would be buying oil futures, not writing code.
Jay