At the same time, the currency was devalued against the US dollar, from 101000 first dollars (101 once revalued) to 250 second dollars, a decrease of about 60% (see exchange rate history table below).[citation needed] ISO originally assigned a new currency code of ZWN to this redenominated currency, but the Reserve Bank of Zimbabwe could not deal with a currency change, so the currency code remained 'ZWD'.[13] The revaluation campaign, which Gideon Gono named "Operation Sunrise", was completed on 21 August 2006. It was estimated that some ten trillion old Zimbabwe dollars (22% of the money supply) were not redeemed during this period.[14]