Currently there is a survey on Monkey Meter which asks "What car do you hate the most?". This survey is trying to determine what cars are most dangerous by driving behavior. Do people with a certain, road rage type behavior, drive BMW's the most? We will see.
This however breaks down the vehicles down by size, and type, not manufacturer. They found that compact cars have the highest occupant fatality rate while "large vans" has the lowest occupant fatality rate. Among the vehicles that had rolled over midsize SUV's have the highest fatality rate while large passenger cars had the lowest.
They provided a pdf file with a complete break down of the statistics which can be found here: Traffic Safety Facts
Information provided by National Highway Traffic Safety Administration