John Q. Investor takes a short position on 7,000 shares of Pepsi (PEP), selling at $137.96 per share on March 20. Dividends are estimated at $4 per year paid quarterly, and the last Ex-date was March 9. JQ's broker charges him $200 for the loan of the shares every six months. JQ covers his position on June 18 at $152.51. Therefore, JQ's holding period rate of return is ____________ % (percent, rounded three places after the decimal)