re: I think I see the source of your confusion
You will note that the value on Laurie's chart corresponding to that average value is where they set the 0% point. This is a purely arbitrary point, like the origin of a coordinate system. Again, when you're not talking percentages, this kind of normalization is unnecessary.
NOW do you see why I don't take the trouble to dispute your posts by checking up on your research? It's too much damned work.