For that indicator, The World Bank provides data for Switzerland from 1960 to 2018. The average value for Switzerland during that period was 4.66 percent with a minumum of -2.09 percent in 1980 and a maximum of 12.08 percent in 2018.
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The trade balance for Switzerland 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).