General Statistics on Unanimity
Strict Unanimity (9–0): Fully unanimous decisions average around 36% of cases annually since 2000, though this number fluctuates year-to-year (ranging anywhere from under 30% to nearly 50% or more depending on the term). [1, 2]
Near-Unanimity (7–2 or 8–1): Lopsided...
— LiberalForum Archive