Question:  The drivers' world championship of the 1990 World Rally Championship was won by Carlos Sainz ahead of Didier Auriol and a Finnish rally driver who won how many world rallies?
Sentence (from "Juha Kankkunen"): Juha Matti Pellervo Kankkunen (   ) (born 2 April 1959 in Laukaa) is a Finnish former rally driver.
Relevant evidence: Yes