Table:
text: List of Formula One World Drivers' Championship runners-up
By season
By season
Season Driver Team Engine Poles Wins Podiums Points Margin_of_defeat
1959 Tony Brooks Ferrari Ferrari 2 2 4 27 4
1960 Bruce McLaren Cooper Climax 0 1 6 34 9
1961 Wolfgang von Trips † Ferrari Ferrari 1 2 4 33 1
1962 Jim Clark Lotus Climax 5 3 3 30 12
1963 Graham Hill BRM BRM 2 2 5 29 25
1964 Graham Hill BRM BRM 1 2 5 39 1
1965 Graham Hill BRM BRM 4 2 6 40 14
1966 John Surtees Ferrari Cooper Ferrari Maserati 2 2 4 28 14
1967 Jack Brabham Brabham Repco 2 2 6 46 5
1968 Jackie Stewart Matra Ford 0 3 4 36 12

Question: What was the defeat rate for the runner-up in the Formula 1 Drivers' World Championship with 30 points?