To be honest I was surprised that they didn't achieve growth in 2013 given the extra services they produced to Chicago, Glasgow and Philadelphia. There must have been decline elsewhere in the route network most probably in the transit business.
The biggest fall was in UK traffic which continues to be in serious decline. It is notable that Ryanair's expansion from Shannon includes very little UK growth so I wouldn't expect that situation to change much in 2014. Of course, the new Ryanair European routes will bring significant growth.