-96.42% is the change from 587 to 21
Calculation steps:
[( 21 - 587 ) ÷ 587] x 100 = -96.42%
Formula
Percentage change = [(21 - 587) / 587] x 100
Subtract the new number by the original number
21 - 587 = -566
-566 ÷ 587 = -0.9642248722316865
-0.9642248722316865 x 100 = -96.42%