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_20 (year_completed VARCHAR, line VARCHAR)
### Question:
What year was the Line of Gardermobanen completed?
### Answer:
SELECT year_completed FROM table_name_20 WHERE line = "gardermobanen"