Here's the question and the answers. I don't understand how they figured out the percentage of increase.

c. Calculate the rate of change in the annual dividend per share for each of the years from 2011 +through 2014 2010 2011 2012 2013 2014 Dividends per share 1.075 1.145 1.16 1.16 1.248 Increase (decrease from prior year) 0.07 0.015 0.00 0.088 Percentage increase 6.5% 1.3% 0.0% 7.6%