For that indicator, The World Bank provides data for Oman from 1967 to 2018. The average value for Oman during that period was 18.08 percent with a minumum of -7.76 percent in 1998 and a maximum of 62.7 percent in 1969.
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The trade balance for Oman and other countries is calculated as the difference between the exports and imports of goods and services, as percent of GDP. A positive number means trade surplus and a negative number means trade deficit.
Definition: External balance on goods and services (formerly resource balance) equals exports of goods and services minus imports of goods and services (previously nonfactor services).