what is the difference in years between his last role and his first role ?
CREATE TABLE table_204_707 (
    id number,
    "year" number,
    "english title" text,
    "chinese title" text,
    "director" text,
    "role" text
)
SELECT MAX("year") - MIN("year") FROM table_204_707
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: what is the difference in years between his last role and his first role ? ### Input: CREATE TABLE table_204_707 (
    id number,
    "year" number,
    "english title" text,
    "chinese title" text,
    "director" text,
    "role" text
) ### Response: SELECT MAX("year") - MIN("year") FROM table_204_707