Slovakia
The Slovak Republic and the Czech Republic went their separate ways after 1 January 1993, an event sometimes called the Velvet Divorce. Slovakia has remained a close partner with the Czech Republic. Both countries co-operate with Hungary and Poland in the Visegrád Group. Slovakia became a member of NATO on 29 March 2004 and of the European Union on 1 May 2004. On 1 January 2009, Slovakia adopted the Euro as its national currency.
Slovak koruna
The graph shows the value of the euro in korunas from 1999 to December 2008. As may be seen, the currency strengthened as Slovakia's economy did. The koruna joined the ERM II on 28 November 2005 at the rate of € = 38.4550 Sk with a 15% band. On 17 March 2007, this rate was readjusted to 35.4424 Sk with the same band, an 8.5% increase in the value of the koruna. On the same day, 1 euro traded at 33.959 Sk. The central rate of koruna was then adjusted once more on 28 May 2008 to 23.8545 with no change in the band.