instruction: What is the number of booking start dates of the apartments with type code 'Duplex' in each year? Return a bar chart, list by the how many booking start date in desc.
response: SELECT booking_start_date, COUNT(booking_start_date) FROM Apartment_Bookings AS T1 JOIN Apartments AS T2 ON T1.apt_id = T2.apt_id WHERE T2.apt_type_code = "Duplex" ORDER BY COUNT(booking_start_date) DESC