During $2,017,$ someone sold a coin at auction for a price of $$11,584.$ Unfortunately for the previous owner, he had purchased it in $2,006$ at a price of $$12,554.$ What was his annual rate of return on this investment in $\%?($A negative answer should be indicated by a minus sign. Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places$)$