CREATE TABLE table_21910 ("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)

This constellation with a ranking of 51 has how many percentages on record?
SELECT COUNT("Per\u00adcent\u00adage") FROM table_21910 WHERE "Rank" = '51'
SELECT COUNT("Per\u00adcent\u00adage") FROM "table_21910" WHERE "Rank" = '51'