A stock had returns of 4.5 percent, 11.5 percent, 8.1 percent, 1.3 percent, 5.7 percent, and 19.4 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