Nile River Scuba has never paid any dividends. Seven years ago, the firm's stock was selling for $$24\mathrm{.}06$ per share. Today the stock is priced at $$43\mathrm{.}80.$ What was the compound annual return over the past $7$ years?$($Round the value to $100$th decimal and Please enter the value only without converting it to a decimal format. If the answer is $8\mathrm{.}5\%,$ enter $8\mathrm{.}5)$