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_83 (year_joined VARCHAR, mascot VARCHAR)
### Question:
Which year did the school with the mascot of the Vikings join?
### Answer:
SELECT year_joined FROM table_name_83 WHERE mascot = "vikings"