The number of characters in common use was restricted, and formal lists of characters to be learned during each grade of school were established, first the 1850-character tōyō kanji 当用漢字 list in 1945, the 1945-character jōyō kanji 常用漢字 list in 1981, and a 2136-character reformed version of the jōyō kanji in 2010.