user: Question: What was the released date of Polarium?
Columns: ['Western Title', 'Chinese Title', 'Pinyin', 'Released Date', 'Genre', 'Game Modes']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Nintendogs', '任天狗狗', 'Rèn Tiāngǒu Gǒu', '2009/2010', 'Platform', 'Single-Player, Muti-Player (1-2)']
SQL:

assistant: SELECT "Released Date" FROM "Table" WHERE "Western Title" = 'Polarium';