how many years has stanford been national champion ?
CREATE TABLE table_203_726 (
    id number,
    "year" number,
    "national champion" text,
    "score" text,
    "runner-up" text,
    "host or site" text
)
SELECT COUNT("year") FROM table_203_726 WHERE "national champion" = 'stanford'
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: how many years has stanford been national champion ? ### Input: CREATE TABLE table_203_726 (
    id number,
    "year" number,
    "national champion" text,
    "score" text,
    "runner-up" text,
    "host or site" text
) ### Response: SELECT COUNT("year") FROM table_203_726 WHERE "national champion" = 'stanford'