In the first redenomination of 1 August 2006, 1000 ZWD were exchanged for 1 second dollar (ZWN). The second dollar started off with an official rate of 250 and a parallel rate of 550 to the US$. By July 2008 the exchange rate with US$ had reached (parallel rate) 500 billion to 1 US$, leading to a second redenomination.