The first figure of the paper they reference [0] has the numbers for this study:

-- 18.5% of females were tuskless before the war

-- 50.9% of females were tuskless after the war

-- 33% of females were tuskless in the first post-war generation

Of the offspring:

-- 8.7% of females born to two-tusked females were two-tusked

-- 44.7% of females born to tuskless females were tuskless

[0]: https://www.science.org/doi/10.1126/science.abe7389#F1