You can find this bet in interwetten for 1.8
Here are this season statistics (how many drivers were classified, (24 started every race)
Bahrein -17, Australia - 14, Malasia - 17, China - 17, Spain - 19, Monaco - 15, Turkey - 20, Canada - 19, Europe - 21, GBR - 20, Germany - 19, Hungary - 19, Belgium - 20, Italy - 20
As you can see, there were at least 19 classified drivers in last 8 races.
This race shouldn't be much different, despite last year there were only 14 finishers (from 20) as there were some really unique incidents, and there was a mechanical problem with 3 cars of Red Bull and Torro Rosso, which was also, quite unique.
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