[mildtrepidation]

This strikes me as the same sort of statistical non-information that people strive to come up with during sports games (at least in the US). "Mr. X is the first person in 17 years to bat Y% during years modulo Z while facing right-handed pitchers with only four fingers on their left hands!"

[Houshalter]

Why is that? It's not just some sampling error, it's the entire social security database, and there is a definite trend over time.