-91.34% is the change from 820 to 71
Calculation steps:
[( 71 - 820 ) ÷ 820] x 100 = -91.34%
Formula
Percentage change = [(71 - 820) / 820] x 100
Subtract the new number by the original number
71 - 820 = -749
-749 ÷ 820 = -0.9134146341463415
-0.9134146341463415 x 100 = -91.34%