In 2014 the immigration net increase was 318,000: Immigration was at 641,000, up from 526,000 in 2013, while the number of emigrants leaving for over a year was 323,000. A recent migration trend has been the arrival of workers from the new EU member states in Eastern Europe, known as the A8 countries. In 2011, citizens of new EU member states made up 13 per cent of immigrants. The UK applied temporary restrictions to citizens of Romania and Bulgaria, which joined the EU in January 2007. Research conducted by the Migration Policy Institute for the Equality and Human Rights Commission suggests that, between May 2004 and September 2009, 1.5 million workers migrated from the new EU member states to the UK, most of them Polish. Many subsequently returned home, resulting in a net increase in the number of nationals of the new member states in the UK. The late-2000s recession in the UK reduced economic incentive for Poles to migrate to the UK, making migration temporary and circular. The proportion of foreign-born people in the UK remains slightly below that of many other European countries.