Which year did Europe produce the most cars?
year refers to model_year; Europe refers to country = 'Europe'; the most cars refers to max(model_year)
SELECT T1.model_year FROM production AS T1 INNER JOIN country AS T2 ON T1.country = T2.origin WHERE T2.country = 'Europe' GROUP BY T1.model_year ORDER BY COUNT(T1.model_year) DESC LIMIT 1
database name:db_id cars
country table country Cols: origin dtype integer, country dtype text, 
price table price Cols: ID dtype integer, price dtype real, 
data table data Cols: ID dtype integer, mileage per gallon dtype real, number of cylinders dtype integer, displacement dtype real, horse power dtype integer, weight dtype integer, acceleration dtype real, model dtype integer, car name dtype text, 
production table production Cols: ID dtype integer, model year dtype integer, country dtype integer, 
