What year was the Line of Gardermobanen completed?
CREATE TABLE table_name_20 (year_completed VARCHAR, line VARCHAR)
SELECT year_completed FROM table_name_20 WHERE line = "gardermobanen"
### 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"