A stock had returns of 13.2 percent, 2.2 percent, 8.6 percent, 2 percent, -9.2 percent, and 3.8 percent over the past six years. What is the geometric average return for this time period? _____% Instruction: Enter your response as a percentage with two decimal places. For example, if your answer is 0.1213=12.13%, please only enter "12.13", please do not enter "0.1213" or "12.13%", the system may not recognize the % sign. You may put negative signs if necessary,