Switzerland Imports from Belgium of Silk Yarn and Yarn Spun from Silk Waste; Silk Worm Gut was US$6.41 Thousand during 2020, according to the United Nations COMTRADE database on international trade. Switzerland Imports from Belgium of Silk Yarn and Yarn Spun from Silk Waste; Silk Worm Gut - data, historical chart and statistics - was last updated on May of 2024.