Table:
text: Werner Pfirter
Grand Prix motorcycle racing results
Grand Prix motorcycle racing results
Year_ Class_ Team Points Wins
1970 250cc Yamaha 0 0
1970 350cc Yamaha 0 0
1971 250cc Yamaha 9 0
1971 350cc Yamaha 33 0
1972 250cc Yamaha 28 0
1972 350cc Yamaha 17 0
1973 250cc Yamaha 20 0
1973 350cc Yamaha 17 0

Question: Count the average wins a 250cc class and year has Werner Pfirter's 1972?

Question: Considering Werner Pfirter, name the lowest wins that have points of 28 and a year less than 1972?

Question: Name the team that has points greater than 9 and a year greater than 1971 and a 250cc class under Werner Pfirter?

Question: Name the victories under Werner Pfirter, who has a 350cc class and is one year younger than 1973?

Question: How many points did Werner Pfirter win?