You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when did ecuador change to the us dollar?" whose answer is March 13, 2000.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did ecuador change to the us dollar
Useful Output:

Doc 1: When the bank was created, the exchange rate was 5 sucres to 1 US dollar; by 1999, it had fallen to 6,825 to the dollar; and by 2000, it had
Doc 2: Ecuador's government formally replaced its national currency, the Sucre, with the U.S. dollar in January 2000.
Doc 3: Sucre until 2000, replaced by the US dollar and Ecuadorian centavo coins. The land that comprises modern-day Ecuador was once home to several groups of
Doc 4: Ecuador used the sucre until the 2000s and changed to the dollar officially (!), so they have treaties with the USA, these make sure that there
Doc 5: Ecuador officially adopted the US dollar as its national currency in the year 2000 after a severe economic crisis caused the collapse of its former currency,