Actually it looks to me that there were 26 days of operation for the three new routes so:
Groningen 22 rotations, load factor 49%
Munster 26 rotations, load factor 28%
Rennes 26 rotations, load factor 60%
I would suggest anything above 45% is very acceptable for a new, previously unserved route ('unserved' meaning perhaps more than 2 or 3 years ago) which was put on sale only two months before commencing so both GRQ and particularly RNS look encouraging. FMO is disappointing but seems similar to Cityjet numbers before they came off the route a few months ago.