-95.8% is the change from 666 to 28
Calculation steps:
[( 28 - 666 ) ÷ 666] x 100 = -95.8%
Formula
Percentage change = [(28 - 666) / 666] x 100
Subtract the new number by the original number
28 - 666 = -638
-638 ÷ 666 = -0.9579579579579579
-0.9579579579579579 x 100 = -95.8%