One year ago, Richard purchased $55$ shares of common stock for $$20$ per share. During the year, he received one dividend payment in the amount of $$0\mathrm{.}60$ per share. If the stock currently is worth $$18$ per share, what yield did Richard earn on his investment for the year? Do not round intermediate calculations. Round your answer to two decimal places. Use a minus sign to enter a negative value, if any.