Reserve currency economy, the German Deutsche Mark gained the status of the second most important reserve currency after the US dollar. When the euro was introduced on 1 January 1999, replacing the Mark, French franc and ten other European currencies, it inherited the status of a major reserve currency from the Mark. Since then, its contribution to official reserves has risen continually as banks seek to diversify their reserves, and trade in the eurozone continues to expand. Former U.S. Federal Reserve Chairman Alan Greenspan said in September 2007 that the euro could replace the U.S. dollar as the world's primary reserve currency.
International status and usage of the euro merely limiting its highest value and not its lowest. The Bulgarian lev is pegged to the euro through a currency board. As part of ERM II, the currencies have a fluctuation band of ±15%. Denmark, however, has committed to a tighter fluctuation band of 2.25%. Convertible mark is the currency of Bosnia and Herzegovina and it was fixed to 1 German mark when it was introduced on the basis of the Dayton agreement; consequently after introduction of the euro, the Convertible mark uses the German-mark-to-euro rate at 1.95583 BAM per euro. Since 2005, stamps issued by the Sovereign Military Order