Market value (or fair value) is calculated as the asset' s potential sale price less the costs necessary for its sale... a 5- year period as the threshold for assessment of a long-term loss of value; a 40 % decline from historical portfolio value as indication of a significant loss of value... the basis for calculation of the provision for renewal is the estimated replacement value at the end of the asset' s' useful life, applying a forecast annual inflation rate of 1 6 %, less the asset' s historical value.