Assuming flights on 1-345-7 and nothing on 25 or 26 Dec, this suggests 12.2 pax per flight in November or about 10.2 pax per flight in December.
Last flight in December was on the 20th - the route was then suspended for two weeks
(as a side note KLM had a Christmas Day flight this year which they haven't had in recent years)
If we assume a 50 seat CRJ 200 then
All flights have been operated by a Cimber CRJ-200 IIRC