Safety #'s should include injuries as well. Otherwise, it's not a safety record. It's a fatality record.
Furthermore, on average 600 children are killed each year traveling too or from school by means other than a school bus. The most deadly method of school transportation is in a passenger vehicle driven by another teenager, followed by bicycle, and then walking.
When you consider that almost 60% of the nations public school students are transported by school bus, the safety record is even more impressive.
Disclaimer: I have no connection to the school bus transportation industry other than the fact that my children ride on a big yellow bus, to and from school each day.