user: Question: When was Color of Green first issued?
Columns: ['Value', 'Color', 'Obverse', 'Reverse', 'First issued']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['2.000 ₲', 'Magenta', 'Adela and Celsa Speratti', 'School parade', 2008.0]
SQL:

assistant: SELECT "First issued" FROM "Table" WHERE "Color" = 'Green';