Revaluation at constant prices (of previous year) is made for GDP both from the production side and from the use side.

UNESCO: Belarus: Report: Part I: Descriptive Section

To re-value the indicators of use of GDP at constant prices, relevant price indices (consumer price index, capital investments price index, etc.) and physical indicators were applied.

UNESCO: Belarus: Report: Part I: Descriptive Section

The indicators of the production of GDP are re-valued at constant prices with the double deflation method where the value added at constant prices is the difference between the value of output and the value of intermediate consumption at constant prices.

UNESCO: Belarus: Report: Part I: Descriptive Section

The back side says that prices drop 30% to 40% per year at a constant performance.

FORBES: Magazine Article