How Many Flights Do Flight Attendants Work In A Year?

It is certainly not the usual nine-to-five, as many jobs are; flight attendants are on duty at all times of the day or night and often for long hours. Even those working domestic or short-haul routes will often work multiple sectors per day. It is not just the hours on the aircraft; they also have duties before and after the flight. On average, how many flights do flight attendants work in a year?