Reserve currency before the beginning of the worldwide credit crunch related recession and Eurozone crisis, which harmed the euro and slowed its adoption. Since 2009, the reserve currency use of the euro has continued to drop, down to 23.9 percent in 2013. The Dutch guilder was the "de facto" reserve currency in Europe in 17th and 18th centuries. The United Kingdom's pound sterling was the primary reserve currency of much of the world in the 19th century and first half of the 20th century. The emergence of the USA as an economic superpower, and the establishment of the U.S. Federal Reserve System
World currency regional central banks. On 26 March 2009, a UN panel of expert economists called for a new global currency reserve scheme to replace the current US dollar-based system. The panel's report pointed out that the "greatly expanded SDR (special drawing rights), with regular or cyclically adjusted emissions calibrated to the size of reserve accumulations, could contribute to global stability, economic strength and global equity." Another world currency was proposed to use conceptual currency to aid the transaction between countries. The basic idea is to utilize the balance of trade to cancel out the currency actually needed to trade. In addition