Article 18 of the Law stipulates that all expenses of enhancements and improvements of each Group of assets incurred during the year will be regarded as expenses, provided that the total amount of such expenses do not exceed 4% of the rest of the value of the Group (ie, after calculating the depreciation at the end of the year in which the expense was incurred ). If these expenses exceed 4% of the rest of the Group, the excess amount will be added to the rest of the value of the Group to be consumed in the following years.