Rarity index by ligne

Hello,

On a coin page we have a Rarity index by page and that is nice because we can see if this coin is already own by multi users or not. But in some cases you have 10 lignes and most of the users have only 1 year.
Can we add a rarity index by ligne with the following calculation = Number of owner of the ligne / Number of wner of the coins.
This way we can see in a coin pages wich years are collected and wich aren't.

Thansk in advance

It would be better if all users could see the number of members who own the coin
Llike the referee for the country

Hello,
I won't implement rarity index by line. The alternative approach described by Idolenz is listed here: https://en.numista.com/forum/topic72983.html