-91.29% is the change from 815 to 71
Calculation steps:
[( 71 - 815 ) ÷ 815] x 100 = -91.29%
Formula
Percentage change = [(71 - 815) / 815] x 100
Subtract the new number by the original number
71 - 815 = -744
-744 ÷ 815 = -0.912883435582822
-0.912883435582822 x 100 = -91.29%