A stock had returns of 14 percent, 6 percent, -0.1 percent, 4.3 percent, 3.8 percent, and 18.8 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.