In 2009, there was a significant decrease in illegal migration at the EU external borders compared to 2008. This decreasing trend was the result of two factors: firstly, employment opportunities, which are the main pull factor for illegal migration to the EU, were reduced by the global economic downturn, and secondly, there was a strong deterrent effect of more effective border controls between Western Africa and the Canary Islands, and between Lybia and the Island of Lampedusa.
Here, you can find their report.