The amount of the reduction indemnity is calculated on the basis of the value of the property given or bequeathed at the time of the partition or its alienation by the beneficiary and according to its condition on the day the gift took effect. If there has been subrogation, the calculation of the reduction indemnity takes into account the value of the new assets at the time of partition, based on their condition at the time of acquisition. However, if the depreciation of the new property was, by reason of its nature, unavoidable on the day of its acquisition, subrogation is not taken into account.