This fiat currency depreciated so rapidly that by 1776 it returned to a silver standard. The asset is depreciated until the book value equals scrap value. On 23 May 2011, the Belarusian ruble depreciated 56% against the United States dollar. A CIP item is not depreciated until the asset is placed in service. This depreciated the value of railroad securities. Debtors benefited by paying off their debts with depreciated paper. It occurs when an investor sells a security that has depreciated in value. At the same time, the asset is depreciated. Common estimation techniques include comparable sales, depreciated cost, and an income approach. For example, in 2015 the Chinese RMB depreciated about 8% against the US dollar. As more money was printed by Congress, the continental dollars depreciated. The lawsuit significantly depreciated his reputation as an employable architect. Land improvements must be depreciated over 15 or 20 years. By September 1791, the value of the assignats had depreciated by 18-20 percent. These notes depreciated rapidly, giving rise to the expression "not worth a continental".