Exchange rate relationships between the U.S. dollar and the euro have been volatile. When the euro began trading at the beginning of 1999, it was valued at 1.17 U.S. dollars. By late-2000, a euro was worth only $.83 and peaked at $1.60 in mid-2008. Calculate the percentage changes in the value of a euro from its initial value to its late-2000 value and to its high mid-2008 value.