have occurred since the base year, which has a divisor equal to 1.00. of the 3 dates. c. Use your findings in parts a and b to describe the general market condition-bull or bear-that existed between August 15,2013 , and August 15,2016. d. Calculate the percentage changes in the average and index values between August 15, 2013, and August 15,2016 . Why do they differ? a. The market average for 1987 is . (Round to two decimal places.) The market average for 2013 is (Round to two decimal places.) The market average for 2016 is (Round to two decimal places.) b. The market index for 1987 is (Round to two decimal places.) The market index for 2013 is . (Round to two decimal places.) The market index for 2016 is (Round to two decimal places.) c. Both the market average and the market index show a general trend, indicating a market. (Select from the drop-down menus.) d. The percentage change in the average value is \%. (Round to two decimal places.) The percentage change in the index value is \%. (Round to two decimal places.) Data table (Click on the icon located on the top-right corner of the data table below in order to copy its contents into a spreadsheet.)