Q: In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Context: He then returned to the Mark Petch team as they began development of a Ford Sierra turbo Link Information: he Probe III design study unveiled at the 1981 Frankfurt Motor Show indicated the direction Ford would be taking with the Sierra. Responsibility for the Sierra design was handled by vice president for design Uwe Bahnsen and chief stylist Patrick le Quement. The Sierra was released in Europe in September 1982, a Question: How many years did it take to develop the Sierra turbo?
A:
Answer: 1