Is that an instinct or a training thing? The previous comment was about nature vs nurture. To conclude anything about either from this chart is presumptuous. I'm honestly not even sure how to research it without doing horrible things to both dogs and people. Especially since owners are as likely to not know the signs of a stressed or aggressive animal as they are to accidentally train the same behaviors
Edit for follow-up question: How do these stats scale when normalized by the population of each breed? That would inform more about whether it's an instinct thing, whether owner culture contributes, or whether it's because there are so many of a given type of animal