I have always read between 75-85%
Perhaps this article from Haaretz has the answer for the low figures.
Eitan Leshem
Oct 1, 2021
If you didn’t know, “Ashkenazi” is a derogatory term in the Israel of 2021. This shouldn’t surprise anyone who lives here, certainly considering the clash between Ashkenazim and Mizrahim in recent years. But the origin of European Jews has now become a curse word.