I wanted to agree with you initially as DogsBite.org states that, "pit bulls contributed to 82% (28) of these deaths [dog-bite fatalities]". However, after going through their website, the only citations they have for these statistics appear to be news articles that report on each of the attacks (34 dog-bite fatalities in 2015). They rely solely on news articles for all facts, this does not sit well with me.

Then I came across the National Canine Research Council that did a comprehensive study in 2013 on dog-bite related fatalities (DBRF) over the last ten years and the researchers identified a striking co-occurrence of multiple, controllable factors, however, breed of dog was not one of them.

The authors report that the breed of the dog or dogs could not be reliably identified in more than 80% of cases. News accounts disagreed with each other and/or with animal control reports in a significant number of incidents, casting doubt on the reliability of breed attributions and more generally for using media reports as a primary source of data for scientific studies. In only 45 (18%) of the cases in this study could these researchers make a valid determination that the animal was a member of a distinct, recognized breed. Twenty different breeds, along with two known mixes, were identified in connection with those 45 incidents.

Four or more of these factors were present in 80.5% of the cases.

• no able-bodied person being present to intervene (87.1%);

• the victim having no familiar relationship with the dog(s) (85.2%);

• the dog(s) owner failing to neuter/spay the dog(s)(84.4%);

• a victim’s compromised ability, whether based on age or physical condition, to manage their interactions with the dog(s) (77.4%);

• the owner keeping dog(s) as resident dog(s), rather than as family pet(s) (76.2%);

• the owner’s prior mismanagement of the dog(s) (37.5%);

• the owner’s abuse or neglect of dog(s) (21.1%).

Lastly, it's also important to keep in mind how rare dog-bite fatalities are. You are 858 times more likely to unintentionally die from a fall than die from a dog-bite. Source