SASfox
The CAA figures for 2006 are as follows for LBA and CWL to/from FNC - CWL shown first each time.
Feb: 167 165 total 332
March: 510 253 total 763
April: 502 275 total 777
May (provisional): 601 289 total 890
This suggests the loads are approximately 2 to 1 in CWL's favour (apart from Feb when presumably the route was started or re-started for the winter period).
Assuming four rotations per month (eight flights) there was still a bit of space on the aircraft on average each month, if a 148-seat aircraft is being used.
As a comparison here are the CAA figures for some other smaller regional airports to/from FNC. I believe these airports have one rotation a week but not shared as with LBA/CWL.
March: EXT 1380 BRS 1657 NCL 1172 EMA 1610
April: EXT 1215 BRS 1616 NCL 1241 EMA 1415
May (provisional): EXT 1508 BRS 1984 NCL 1226 EMA no figure, presumably no flight.