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_174491_2 (fis_nordic_world_ski_championships VARCHAR, winner VARCHAR)
### Question:
What years did Birger Ruud win the FIS Nordic World Ski Championships?
### Answer:
SELECT fis_nordic_world_ski_championships FROM table_174491_2 WHERE winner = "Birger Ruud"