1) large values at the beginning and at the end of a dynasty; AND
2) small values in all the other years.
Ming and Qing collapsed when people's names became longer than when the dynasties started.
Another anecdote is that almost all characters in Romance of the Three Kingdoms have one-character names.
Who knew that one or two characters could connote not only one's lineage, social class, family aspirations, gender identity, but also the rise and fall of dynasties!