This document decribes, how extraction of peat in Mikkeli was downscaled from data of South-Savo and how unit conversion was made from hectares to tonnes.

Original data: The area under peat production in Southern Savonia in 2019 was 1,616 ha (AFRY 2020, page 26)
https://afry.com/sites/default/files/2020-08/tem_turpeen_kayton_analyysi_loppuraportti_0.pdf