Upintheair
"from 2003 to 2007, freight tonnage increased at the airport by 245%, although 2007 was a little down on the 2006 high. In the new management's first year in charge of Coventry Airport (2006), freight actually more than doubled year on year."
Some incorrect facts there
Freight 2003 3314 tonnes
2004 3299 tonnes
2005 6142 tonnes
2006 7785 tonnes
2007 7469 tonnes
If freight had actually doubled in the first year of operation should have been 12284 tonnes figure for 2006, admittedly was up from 2005 but a lot less of a jump than it was from 2005-6, which was pretty much doubled.
Dropped 4% year on year though from 2006-2007, and with the figures Sep07 to Sep08 seeing a 28% drop in freight aircraft(before the majority of closures) doesn't look likely to be great this year either.
Haven't bothered to check your bizjet figures yet, but suspect probably from the same "spinning" machine you got your freight ones from