-26.8% is the change from 668 to 489
Calculation steps:
[( 489 - 668 ) ÷ 668] x 100 = -26.8%
Formula
Percentage change = [(489 - 668) / 668] x 100
Subtract the new number by the original number
489 - 668 = -179
-179 ÷ 668 = -0.2679640718562874
-0.2679640718562874 x 100 = -26.8%