A stock had returns of 3.3 percent, 6.5 percent, -5.4 percent, -7.7 percent, -13.1 percent, and 0.6 percent over the past six years. What is the arithmetic 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,