CREATE TABLE table_16599 ("No." FLOAT, "Episode" TEXT, "Air Date" TEXT, "Timeslot" TEXT, "Rating" TEXT, "Share" TEXT, "18\\u201349  ( Rating/Share ) " TEXT, "Viewers  ( m ) " TEXT, "Rank  ( # ) " TEXT)

What's the 18-49 (rating/share) of the episode that originally aired on May 5, 2009?
SELECT "18\u201349 (Rating/Share)" FROM table_16599 WHERE "Air Date" = 'May 5, 2009'
SELECT "18\u201349 (Rating/Share)" FROM "table_16599" WHERE "Air Date" = 'May 5, 2009'