Proxy data source description. The total output of the site fluctuates around 1.6 Mt a -1 , which is a medium size for chemical plants. The share of a broad range of surfactants to the total production amount is about 45 %, which makes this the main product group from the site, while downstream products related to rock salt electrolysis (PVC, vinyl chloride monomers and caustic soda) represent the second major group of products, with a share around 35 %.