John invested $1,000 in large U.S. stocks at the beginning of 2017. The inveatment earned 17.347, in 2017, 12.72\% in 2018 and 6.36% in 2019. What was the average annual return (geometric) that John earned during this three-year period? (Arovide your onswer as a % and round to two (2) decimal places)