1950 Italian Grand Prix

Columns: Pos | No | Driver | Constructor | Time | Gap
15 | 30 | Prince Bira | Maserati | 2:14.0 | + 15.4 | 16 | 24 | Philippe Étancelin | Talbot-Lago - Talbot | 2:14.4 | + 15.8 | 17 | 38 | Toulo de Graffenried | Maserati | 2:14.4 | + 15.8 | 18 | 8 | Peter Whitehead | Ferrari | 2:16.2 | + 17.6 | 19 | 6 | Louis Chiron | Maserati | 2:17.2 | + 18.6 | 20 | 56 | Pierre Levegh | Talbot-Lago - Talbot | 2:17.2 | + 18.6

Example questions:
The driver that came in 2nd place in the qualifying of the 1950 Italian Grand Prix had won world titles in which two years ? | What year was the driver with a time gap of +14.6 in the qualifying of the 1950 Italian Grand Prix born in ? | What year did the driver in the qualifying of the 1950 Italian Grand Prix who represented the number 24 pass away in ? | What is the total winning percentage for the driver who came in first place in the qualifying of the 1950 Italian Grand Prix ?

Answers:
1952 and 1953 | 1910 | 1981 | 46.15%