This documentation is already there:

but I suggest to use this one:

and this is THE year line!

My suggestion to repair that:

I suggest these two year lines:
Here are the features (the Y#52.2 is not even mentioned!):

I know it's difficult to split the existing year line into two, since the coin is already 60 years old, next year it'll be even more difficult.
I have made the CR, since I saw the year line were still open, so sorry for having used the space here and not in the proper section🤢
