Canadian Dollar/U.S. Dollar. The Canadian dollar's value against the U.S. dollar has seen some significant changes over recent history. Using the graph of the C$/US$ exchange rate for the 35-year period between 1980 and January 2015 to estimate the percentage change in the Canadian dollar's value (affectionately known as the "loonie") versus the dollar for the following periods. a. January 1980-January 1986 b. January 1986-October 1991 c. October 1991-December 2001 d. December 2001-April 2011 e. April 2011-January 2015 Canadian Dollar/U.S. Dollar. The Canadian dollar's value against the U.S. dollar has seen some significant changes over recent history. Using the graph of the C$/US$ exchange rate for the 35-year period between 1980 and January 2015 to estimate the percentage change in the Canadian dollar's value (affectionately known as the "loonie") versus the dollar for the following periods. a. January 1980-January 1986 b. January 1986-October 1991 c. October 1991-December 2001 d. December 2001-April 2011 e. April 2011-January 2015