Based on the provided forecast data for Switzerland's oil pipeline transport volume from 2024 to 2028, there is a consistent declining trend. The volume decreases from 60.7 million tonne kilometers in 2024 to 30.14 million tonne kilometers in 2028. Comparing 2024 to the previous year, 2023, there is no direct data; however, it can be inferred that 2023 saw higher volumes. The year-on-year variations demonstrate a decline with a noticeable decrease each year. Over this period, the Compound Annual Growth Rate (CAGR) indicates an average annual reduction.

Future trends to watch for include:

Technological advancements and efficiency improvements in pipeline infrastructure.
Policy changes regarding carbon emissions and fossil fuel dependency.
Competition from other modes of transport and alternative energy sources.