There won't be any substantial increase in pax throughput until the development plan is completed (2016?). Capacity is very limited at present, restricting the ability of the operator to search out major new business.
There will probably be a year-on-year increase in 2014 with known developments (5th based Monarch, extra Wizz and new operators more than offsetting the loss of FlyBe).
Once new stands come into commission, and the growth in the UK economy becomes better established, growth will increase more markedly.