I agree with Barling Magna's calculation. There were 21 rotatons (42 legs) on BRS-HAM in March which with a total of 706 passengers gives an average load of 16.8.
The route started part way through February and 522 passengers were carried in that month giving an average load of 18.6.
BRS-FRA didn't start until April - the CAA, from whose stats the above figures were taken, will be reporting April's numbers in a couple of weeks's time.
It's not been possible to ascertain the average monthly loads on bmi regional's BRS-ABZ because Eastern also operated the route (until a couple of weeks ago).