-86.53% is the change from 646 to 87
Calculation steps:
[( 87 - 646 ) ÷ 646] x 100 = -86.53%
Formula
Percentage change = [(87 - 646) / 646] x 100
Subtract the new number by the original number
87 - 646 = -559
-559 ÷ 646 = -0.8653250773993808
-0.8653250773993808 x 100 = -86.53%