CREATE TABLE table_21188 ("Episode number" FLOAT, "Episode" TEXT, "Rating" TEXT, "Share" FLOAT, "Rating/Share  ( 18-49 ) " TEXT, "Viewers  ( millions ) " TEXT, "Rank  ( Overall ) " TEXT)

How many were the shares when the viewers reached 3.11 million?
SELECT COUNT("Share") FROM table_21188 WHERE "Viewers (millions)" = '3.11'
SELECT COUNT("Share") FROM "table_21188" WHERE "Viewers (millions)" = '3.11'