Adding a -year- option to the list?

[Joppnl]

Hello,

 

when I am in the -list-  menu where I can choose tables of a specific era or brand I do miss the option 1960 ('s) as the oldest selection of tables starts from the 70-s.

 

I looked everywhere if there is a xml-file where I could add this but couldn't find it so the question is: is it possible to add this category (myself)?

Thanks!