CREATE TABLE table_15924 ("Season" CLOB, "Network" CLOB, "Season premiere" CLOB, "Season finale" CLOB, "TV season" CLOB, "Ranking" CLOB, "Viewers  ( in millions ) " CLOB)

What was the ranking of the season finale aired on May 8, 2006?
SELECT "Ranking" FROM table_15924 WHERE "Season finale" = 'May 8, 2006'
SELECT "Ranking" FROM "table_15924" WHERE "Season finale" = 'May 8, 2006'