The Mexican peso (MXN) has faced some turbulence since the beginning of the global financial crisis. Because the Mexican economy is so tied up in that of the United States, U.S. financial turmoil led to a serious drop in foreign demand for the peso. Mexico's peso has not gained as quickly as other emerging markets, primarily due to concerns about the U.S. economy, Reuters reported in August 2009. The currency was also negatively affected when the April 2009 H1N1 virus outbreak, believed to have originated in Mexico, caused investment in Mexican assets to sink. The current version of the MXN has been in use since the Mexican central bank reissued it in 1993, making one new peso equal to 1,000 of the obsolete ones.