Interesting. Transatlantic traffic has increased massively since 2012, next summer there will be 6 daily services to the USA, at least one of which will be operated by a 767-300.
European traffic has also increased, but will probably fall for 2016 should no new services/service increases be announced.
UK traffic has collapsed this year, with the weak pound and the loss of most of stobarts operations, I don't think we are any better off than in 2012.
Transit has fallen significantly, I doubt we will ever see much of it return and to be honest its not vital to the airport.