When was the University founded that joined in 1978?
CREATE TABLE table_27721 (
    "Institution" text,
    "Location" text,
    "Nickname" text,
    "Founded" real,
    "Type" text,
    "Enrollment" real,
    "Joined" real
)
SELECT MAX("Founded") FROM table_27721 WHERE "Joined" = '1978'
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: When was the University founded that joined in 1978? ### Input: CREATE TABLE table_27721 (
    "Institution" text,
    "Location" text,
    "Nickname" text,
    "Founded" real,
    "Type" text,
    "Enrollment" real,
    "Joined" real
) ### Response: SELECT MAX("Founded") FROM table_27721 WHERE "Joined" = '1978'