Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_12983929_1 (shut_down VARCHAR, commercial_operation VARCHAR)
### Question:
What's the shut down state of the unit that's been in commercial operation since 01.02.1984?
### Answer:
SELECT shut_down FROM table_12983929_1 WHERE commercial_operation = "01.02.1984"