-20.39% is the change from 770 to 613
Calculation steps:
[( 613 - 770 ) ÷ 770] x 100 = -20.39%
Formula
Percentage change = [(613 - 770) / 770] x 100
Subtract the new number by the original number
613 - 770 = -157
-157 ÷ 770 = -0.2038961038961039
-0.2038961038961039 x 100 = -20.39%