"This issue looks at three categories of immigrants in the EU-27 Member States..: nationals, citizens of other EU-27 countries (including Bulgaria and Romania, which joined the EU on 1 January 2007), and non-EU citizens, with particular regard to their age, sex and country of citizenship, as of 2006. Analysis of the figures shows the overall picture of immigration in the EU-27 and the different patterns of immigration in the Member States." (Quoted from report)