What percentage of 1964 nickels are Extra Water Line?

Does anyone have any stats on this?
I have a lot of 1964's that I have not checked and I want to know if it makes sense to do so.
Google didn't have any stats on the rarity that I could find.
I have a lot of 1964's that I have not checked and I want to know if it makes sense to do so.
Google didn't have any stats on the rarity that I could find.