a) effective value - the reduction of greenhouse gas emissions for some or all stages of a specific biofuel production process, calculated in accordance with the methodology established in part C of the annex; b) typical value - an estimate of the representative reduction of greenhouse gas emissions for a certain biofuel production chain; c) default value - a value derived from a typical value by applying predetermined factors and which can, under certain conditions specified by this decision, be used instead of an actual value; d) fuel suppliers - economic operators, respectively warehouses, registered recipients, importers, who introduce fuels subject to the payment of excise duties on the market in Romania. Art. 3. - (1) To achieve the objective provided for in art. 5 para. (5) of the Law, fuel suppliers introduce on the market only gasoline and diesel fuel with a biofuel content as follows: a) from the date of entry into force of this decision, diesel fuel with a biofuel content of at least 5% by volume; b) Repealed by point 1. of Decision no. 1308/2012 starting from 28.12.2012. c) from January 1, 2016, diesel with a biofuel content of at least 7% by volume; Letter c) was modified by point 2. of Decision no. 1308/2012 starting from 28.12.2012.