4.The product-related historical activity level for the baseline period for products to which the steam cracking product benchmark as referred to in Annex I applies shall be determined according to the following formula:U.K.
whereby:
:
historical activity level for high value chemicals net of high value chemicals produced from supplemental feed expressed in tonnes of HVC
:
historical activity level for total high value chemicals production in year k of the baseline period expressed in tonnes of HVC
:
historical supplemental feed of hydrogen in year k of the baseline period expressed in tonnes of hydrogen
:
historical supplemental feed of ethylene in year k of the baseline period expressed in tonnes of ethylene
:
historical supplemental feed of other high value chemicals than hydrogen and ethylene in year k of the baseline period expressed in tonnes of HVC