The country's credit rating already has been downgraded at Standard & Poor's, and last Friday Moody's put the kingdom's Aa3 rating on review for possible downgrade. In 2015, hydrocarbons accounted for about 84% of exports, about 40% of gross domestic product and around 62% of consolidated government revenues. The country's economic output could fall by nearly 18% again in 2016. In its rating review, Moody's said that a downgrade would occur if the reviewers "conclude that the government's plans are unlikely to be adequate to sustain Saudi Arabia's economic or government balance sheet strength." The firm continued: