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_name_81 (years_runner_up VARCHAR, team VARCHAR)
### Question:
What year(s) was Duisburg runner-up?
### Answer:
SELECT years_runner_up FROM table_name_81 WHERE team = "duisburg"