What year was the class 253 larger than 18 built?
CREATE TABLE table_55822 (
    "Class" text,
    "Operator" text,
    "Number" real,
    "Year Built" text,
    "Cars per Set" real,
    "Unit Numbers." text
)
SELECT "Year Built" FROM table_55822 WHERE "Class" = 'class 253' AND "Number" > '18'
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 year was the class 253 larger than 18 built? ### Input: CREATE TABLE table_55822 (
    "Class" text,
    "Operator" text,
    "Number" real,
    "Year Built" text,
    "Cars per Set" real,
    "Unit Numbers." text
) ### Response: SELECT "Year Built" FROM table_55822 WHERE "Class" = 'class 253' AND "Number" > '18'