How many cars with horsepower greater than 200 were produced in 1975?
horsepower greater than 200 refers to horsepower > 200; in 1975 refers to model_year = 1975
SELECT COUNT(T2.model_year) FROM data AS T1 INNER JOIN production AS T2 ON T1.ID = T2.ID WHERE T1.horsepower > 200 AND T2.model_year = 1975