As Bloomberg reports,

The dollar hasn't budged from its top spot for the past three decades, withstanding repeated efforts to unseat it. Almost 90 percent of the $5.3 trillion a day in foreign-exchange transactions last year involved the dollar, the same share as in 1989, data from the Bank for International Settlements show. More than 80 percent of trade finance was done in dollars in 2013, according to Swift, a global financial-messaging network.