Eurobarometer surveys of EU citizens show that trust in the EU and its institutions has declined strongly since a peak in 2007. Since then, it has been consistently below 50%. A 2009 survey showed that support for EU membership was lowest in the United Kingdom (UK), Latvia and Hungary. By 2016, the countries viewing the EU most unfavourably were the UK, Greece, France and Spain. A referendum on continued EU membership was held in the UK in 2016 which resulted in a 51.9% vote in favour of leaving the EU. The UK officially left the EU on 31 January 2020. Since 2015, trust in the EU has risen slightly in most EU countries as a result of falling unemployment rates and accelerating economic growth.