Is the important metric "hours" or "sorties" flown? It appears that all of them were either a display or a practice in that aircraft.
Sorties / hours /displays or practices.
11/6/ 5
15/11/11
18/13/13
26/19/18/
9/10/7
Won't comment further but sometimes hours (for short flights) might not be as significant as number of sorties flown.