CREATE TABLE table_21907 ("Rank" FLOAT, "Family" TEXT, "Abbre\\u00adviation" TEXT, "Constellation" TEXT, "Area  ( sq.deg. ) " TEXT, "Area  ( msr ) " TEXT, "Per\\u00adcent\\u00adage" TEXT, "Right ascension  ( hm ) " TEXT, "Decli\\u00adnation  ( dm ) " TEXT, "Quad" TEXT)

What is the percentage of this constellation abbreviated as 'nor'?
SELECT "Per\u00adcent\u00adage" FROM table_21907 WHERE "Abbre\u00adviation" = 'Nor'
SELECT "Per\u00adcent\u00adage" FROM "table_21907" WHERE "Abbre\u00adviation" = 'Nor'