↑ 3.0 3.1 3.2 3.3 International Monetary Fund, Report for Selected Countries and Subjects World Economic Outlook Database, April 2018.
↑ ३.० ३.१ ३.२ ३.३ "Report for Selected Countries and Subjects", World Economic Outlook Database, International Monetary Fund, अक्टोबर २०१२, अभिगमन मिति २२ जनवरी २०१३।