Exactly. So when you look at any data for those 10 years you could likely be in the 95+ percentile. Very likely. So none of the results of analysis ever changes. To a man with a hammer everything looks like a nail. Cognitive dissonance is the tendency of the brain when confronted with data which obviously conflicts with the confirmed perception your brain will establish links which don't exist to rationalize the conflicting reality so the confirmed perception remains intact.