CREATE TABLE table_23054 ("Rank" TEXT, "Rating" TEXT, "Completion Percentage" TEXT, "Touchdown Percentage" TEXT, "Yards Per Attempt" TEXT, "Total Yards" TEXT)

What is the completion percentage when yards per attempt was done by Steve McNair : 2003?
SELECT "Completion Percentage" FROM table_23054 WHERE "Yards Per Attempt" = 'Steve McNair : 2003'
SELECT "Completion Percentage" FROM "table_23054" WHERE "Yards Per Attempt" = 'Steve McNair : 2003'