Of course, that is assuming that the numbers used to calculate the national average are correct. I am not sure there is any registry of exactly how many jumps are made each year. Also, does that include civilian and military and are there statistical difference between the populations.
Some of it can be set by the “culture” of the club. When I was jumping in the late 70’s it was at a club near Cleveland that had a great safety record. They didn’t tolerate any horseplay or nuttiness. Another club in Xenia (at the time)had a group called “The Herd” that was always trying to outdo each other. They had a higher accident rate.
Both are still in business.