The Canadian dollar's value against the U.S. dollar has seen some significant changes over recent history. Using

Question:

The Canadian dollar's value against the U.S. dollar has seen some significant changes over recent history. Using the following graph of the C$/US$ exchange rate for the 30 year period between 1980 and end-of-year 2010 to estimate the percentage change in the Canadian dollar's value (its affectionately known as the "loonie") versus the dollar for the following periods.

Exchange Rate
The value of one currency for the purpose of conversion to another. Exchange Rate means on any day, for purposes of determining the Dollar Equivalent of any currency other than Dollars, the rate at which such currency may be exchanged into Dollars...