Monthly provisional net imports of gas. Net imports are understood as the difference between total gas flows into Switzerland and gas flows from Switzerland to neighbouring countries. The data take into account the gas flows of Swissgas and five regional companies. Certain subordinate gas flows are not available on a monthly basis, but are only reported annually. These accounted for around 5 percent of the total volume in 2021. The data refer to the calorific value Hs (formerly upper calorific value Ho).