Aug 03, 2021 · 05 July 2021. US: The United States Geological Survey's (USGS) Gypsum in the First Quarter 2021 report has shown a 2% yearonyear increase in sales of gypsumbased board products to 624Mm 2 in the first quarter of 2021 from 609Mm 2 in the same period in 2020. Calcined gypsum used by board producers rose by 3% to from