Thats hardly a bad figure, given that (assuming all passengers both departed and arrived through NWI) 210,000 used the airport last year. That would equate to 74% of the population of Norwich. Of course I would assume that the catchment area is significantly bigger than 300,000 though, and then consider that STN isn't too far away!
And also assuming that 100% of departing using NWI were on their outbound leg, ie no inbound tourists / business pax?
My reference to NWI was more that Badajoz is out of the way.
Higher yields from CGN v HHN or NRN not surprising considering it is so much better connected by road and rail. More evidence of Ryanair becoming the high yield airline rather than the low cost one!