A small watershed receives 90 mm of rainfall in a day. If the initial abstraction is considered as 25% of the potential maximum retention of soil, and the land use changes from forest (with \(S = 136\) mm) to cultivated land (with \(S = 64\) mm), the change in daily runoff volume in percent is \(\underline{\hspace{1cm}}\) (round off to one decimal place).