user: Question: On what date was it announced that an asset was acquired for US$9 million? 
Columns: ['Asset Acquired', 'Acquired From', 'Date Announced', 'Date Completed', 'Reported Cost']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['mPower.com, Inc', 'Privately Held', 'May 30, 2003', 'July 2, 2003', 'Not Disclosed']
SQL:

assistant: SELECT "Date Announced" FROM "Table" WHERE "Reported Cost" = 'US$9 million';