The economy of Slovakia is based upon Slovakia becoming an EU member state in 2004, and adopting the euro at the beginning of 2009. Its capital, Bratislava, is the largest financial centre in Slovakia. As of Q1 2018, the unemployment rate was 5.72%. Due to the Slovak GDP growing very strongly from 2000 until 2008 – e.g. 10.4% GDP growth in 2007 – the Slovak economy was referred to as the Tatra Tiger.