Catalogue contributions [Risolto]

Trying to make sense of the Catalogue contributions.
pages added & pages edited - can understand.
years added & years edited - how does that work?

Most are quite self explanatory:

Page added - number of new coin/note pages added
Years added - number of new year lines added
Pages edited - number of edits on the page except the year line comments
Years edited - number of year line comments edited

Thanks Idolenz

Cita: "Idolenz"​​Years edited - number of year line comments edited

​Not only the year line comments edited but also new year lines added.