-86.47% is the change from 643 to 87
Calculation steps:
[( 87 - 643 ) ÷ 643] x 100 = -86.47%
Formula
Percentage change = [(87 - 643) / 643] x 100
Subtract the new number by the original number
87 - 643 = -556
-556 ÷ 643 = -0.864696734059098
-0.864696734059098 x 100 = -86.47%