Which year did the school with the mascot of the Vikings join?
CREATE TABLE table_66013 (
    "School" text,
    "Location" text,
    "Mascot" text,
    "County" text,
    "Year Joined" text,
    "Year Left" text
)
SELECT "Year Joined" FROM table_66013 WHERE "Mascot" = 'vikings'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: Which year did the school with the mascot of the Vikings join? ### Input: CREATE TABLE table_66013 (
    "School" text,
    "Location" text,
    "Mascot" text,
    "County" text,
    "Year Joined" text,
    "Year Left" text
) ### Response: SELECT "Year Joined" FROM table_66013 WHERE "Mascot" = 'vikings'