-81.69% is the change from 71 to 13
Calculation steps:
[( 13 - 71 ) ÷ 71] x 100 = -81.69%
Formula
Percentage change = [(13 - 71) / 71] x 100
Subtract the new number by the original number
13 - 71 = -58
-58 ÷ 71 = -0.8169014084507042
-0.8169014084507042 x 100 = -81.69%