CREATE TABLE table_1708 ("Episode #" FLOAT, "US air date" TEXT, "Rating" TEXT, "Share" TEXT, "Rating/Share  ( 18\\u201349 ) " TEXT, "Viewers  ( millions ) " TEXT)

How many share values are listed for the episode with a rating/share value of 2.6/8?
SELECT COUNT("Share") FROM table_1708 WHERE "Rating/Share (18\u201349)" = '2.6/8'
SELECT COUNT("Share") FROM "table_1708" WHERE "Rating/Share (18\u201349)" = '2.6/8'