what was the only year to use the code ch ?
CREATE TABLE table_203_248 (
    id number,
    "code" text,
    "year" number
)
SELECT "year" FROM table_203_248 WHERE "code" = 'ch'
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 was the only year to use the code ch ? ### Input: CREATE TABLE table_203_248 (
    id number,
    "code" text,
    "year" number
) ### Response: SELECT "year" FROM table_203_248 WHERE "code" = 'ch'