Without knowing exactly how many flight hours were flown in each category, a rate comparison isn't possible.
I wonder how many of these " part 91 registered business airplanes" were comparable to what the fractionals (91K) fly and how many of them were professionally flown versus owner flown? Comparing single pilot owner flown turboprops & light jets to pro trained crew flown large cabin jets wouldn't tell us much we don't already know would it?