-95.81% is the change from 668 to 28
Calculation steps:
[( 28 - 668 ) ÷ 668] x 100 = -95.81%
Formula
Percentage change = [(28 - 668) / 668] x 100
Subtract the new number by the original number
28 - 668 = -640
-640 ÷ 668 = -0.9580838323353293
-0.9580838323353293 x 100 = -95.81%