-87.99% is the change from 591 to 71
Calculation steps:
[( 71 - 591 ) ÷ 591] x 100 = -87.99%
Formula
Percentage change = [(71 - 591) / 591] x 100
Subtract the new number by the original number
71 - 591 = -520
-520 ÷ 591 = -0.8798646362098139
-0.8798646362098139 x 100 = -87.99%