Thanks to both of you -- NoOne's test method ought to help me figure this out. Although, do any of the developers know for sure?
My personal suggestion to the developers is that "Current Year" *ought* to mean "the most current year for which we have stats": thus 1984 should be "Current Year" and 1982 "2 Years Ago" until Opening Day of 1985. But meanwhile, yes: Lukasberger and NoOne are being helpful, but a definitive view of the actual programming would be nice.