I've just read these in a book but I'm not quite sure what these words mean - there's not much at all on the Internet about them either.
I think 習々年 might mean "over the years" as 習々 seems to mean "light breeze", so "a gentle passing of the years" might make sense.
I'm a bit less sure of 習年 though.
Any help would be much appreciated :)
Context: ..., その年と習年, そして習々年までも耕作を禁じられた。