Revise
Flashcards of the latest official figures. Say the answer in your head, then check it. Cards you know drop out; when a figure is updated, its card comes back.
Keys: Space to show the answer, ← to see it again later, → if you knew it. Cards you know come back after 1, 3, 7, 16 and then 35 days, and at once if their figure changes. Progress is stored only in this browser. "Export for Anki" downloads the cards shown as a file Anki can import (tab-separated: front, back).