#3 Alex Caffi - 12

Alex Caffi's first full Formula One season was a disaster for he never managed to see the chequered flag. His was classified only once that season, which happened at the 1987 San Marino Grand Prix.
The Italian retired from the first Grand Prix at Brazil and continued his poor run until the Spanish Grand Prix. His embarrassing run ended at Spain for he failed to qualify for that Grand Prix.
His twelve successive retirements were largely due to the unreliable vehicle that he had driven that year. Caffi suffered three engine failures and two electrical failures during his unfortunate run.
With fourteen retirements in the entire season, Alex Caffi completed less than 50% of the assigned laps that season. This resulted in him finishing the season with zero points on the championship table.