Question: Calculate the average production rate per year from 1971 to 1980. Among them, name the cars with a weight of fewer than 1800 lbs.
SQL: SELECT CAST(COUNT(T1.ID) AS REAL) / 9 FROM production AS T1 INNER JOIN data AS T2 ON T2.ID = T1.ID WHERE T1.model_year BETWEEN 1971 AND 1980 UNION ALL SELECT DISTINCT T2.car_name FROM production AS T1 INNER JOIN data AS T2 ON T2.ID = T1.ID WHERE T1.model_year BETWEEN 1971 AND 1980 AND T2.weight < 1800