What is the 20 year for Nitrous Oxide?
CREATE TABLE table_21350772_2 (
    gas_name VARCHAR
)
SELECT 20 AS _yr FROM table_21350772_2 WHERE gas_name = "Nitrous oxide"
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 20 year for Nitrous Oxide? ### Input: CREATE TABLE table_21350772_2 (
    gas_name VARCHAR
) ### Response: SELECT 20 AS _yr FROM table_21350772_2 WHERE gas_name = "Nitrous oxide"