Please list all the years in which the car model Chevrolet Impala was introduced in the market.
year refers to model_year; Chevrolet Impala refers to car_name = 'chevrolet impala'
SELECT DISTINCT T1.model_year FROM production AS T1 INNER JOIN data AS T2 ON T1.ID = T2.ID WHERE T2.car_name = 'chevrolet impala'
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, 
