CREATE TABLE table_18942 ("Asset Acquired" TEXT, "Acquired From" TEXT, "Date Announced" TEXT, "Date Completed" TEXT, "Reported Cost" TEXT)

On what date was it announced that an asset was acquired for US$9 Million?
SELECT "Date Announced" FROM table_18942 WHERE "Reported Cost" = 'US$9 million'
SELECT "Date Announced" FROM "table_18942" WHERE "Reported Cost" = 'US$9 million'