CREATE TABLE table_30638 ("Rank" FLOAT, "Country" TEXT, "Miss Universe" TEXT, "1st Runner-up" FLOAT, "2nd Runner-up" FLOAT, "3rd Runner-up" FLOAT, "4th Runner-up" FLOAT, "Semifinalists" FLOAT, "Total" FLOAT)

Which country has had 6 miss universe's?
SELECT "Country" FROM table_30638 WHERE "Miss Universe" = '6'
SELECT "Country" FROM "table_30638" WHERE "Miss Universe" = '6'