Our #seaice team has developed a Sea Ice Index, online since several years, at https://osisaf-hl.met.no/v2p2-sea-ice-index. It offers visuals of the trends and evolution of sea ice at hemispheric, global and regional scales. It includes the sea-ice extent and area since 1978, and is continuously updated.
The OSI SAF Sea Ice Index is derived from our Global Sea Ice Concentration Climate data record, with R&D input from @esa Climate Change Initiative.
For more info on the product, see:
https://osi-saf.eumetsat.int/products/osi-420