When was the earliest founded university?
CREATE TABLE table_28406 (
    "Institution" text,
    "Location" text,
    "Nickname" text,
    "Founded" real,
    "Type" text,
    "Enrollment" real,
    "Joined" text
)
SELECT MIN("Founded") FROM table_28406
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 earliest founded university? ### Input: CREATE TABLE table_28406 (
    "Institution" text,
    "Location" text,
    "Nickname" text,
    "Founded" real,
    "Type" text,
    "Enrollment" real,
    "Joined" text
) ### Response: SELECT MIN("Founded") FROM table_28406