CREATE TABLE table_30646 ("No." FLOAT, "#" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "U.S. air date" CLOB, "Production code" FLOAT, "U.S. viewers  ( million ) " CLOB)

How many millions of viewers are listed where the writer is Matthew Okumura?
SELECT "U.S. viewers (million)" FROM table_30646 WHERE "Written by" = 'Matthew Okumura'
SELECT "U.S. viewers (million)" FROM "table_30646" WHERE "Written by" = 'Matthew Okumura'